diff --git a/src/main/java/org/kohsuke/github/GHPullRequest.java b/src/main/java/org/kohsuke/github/GHPullRequest.java
index 824050c07d..c63e7b7eb0 100644
--- a/src/main/java/org/kohsuke/github/GHPullRequest.java
+++ b/src/main/java/org/kohsuke/github/GHPullRequest.java
@@ -37,6 +37,7 @@
 
 import javax.annotation.CheckForNull;
 
+import static org.kohsuke.github.Previews.LYDIAN;
 import static org.kohsuke.github.Previews.SHADOW_CAT;
 
 /**
@@ -565,6 +566,41 @@ public void requestTeamReviewers(List<GHTeam> teams) throws IOException {
                 .send();
     }
 
+    /**
+     * Set the base branch on the pull request
+     *
+     * @param newBaseBranch
+     *            the name of the new base branch
+     * @throws IOException
+     *             the io exception
+     * @return the updated pull request
+     */
+    public GHPullRequest setBaseBranch(String newBaseBranch) throws IOException {
+        return root.createRequest()
+                .method("PATCH")
+                .with("base", newBaseBranch)
+                .withUrlPath(getApiRoute())
+                .fetch(GHPullRequest.class)
+                .wrapUp(root);
+    }
+
+    /**
+     * Updates the branch. The same as pressing the button in the web GUI.
+     *
+     * @throws IOException
+     *             the io exception
+     */
+    @Preview
+    @Deprecated
+    public void updateBranch() throws IOException {
+        root.createRequest()
+                .withPreview(LYDIAN)
+                .method("PUT")
+                .with("expected_head_sha", head.getSha())
+                .withUrlPath(getApiRoute() + "/update-branch")
+                .send();
+    }
+
     /**
      * Merge this pull request.
      * <p>
diff --git a/src/main/java/org/kohsuke/github/Previews.java b/src/main/java/org/kohsuke/github/Previews.java
index a50425f470..5af2cfa4b4 100644
--- a/src/main/java/org/kohsuke/github/Previews.java
+++ b/src/main/java/org/kohsuke/github/Previews.java
@@ -44,6 +44,13 @@ class Previews {
      */
     static final String INERTIA = "application/vnd.github.inertia-preview+json";
 
+    /**
+     * Update a pull request branch
+     *
+     * @see <a href="https://developer.github.com/v3/previews/#update-a-pull-request-branch">GitHub API Previews</a>
+     */
+    static final String LYDIAN = "application/vnd.github.lydian-preview+json";
+
     /**
      * Require multiple approving reviews
      *
diff --git a/src/test/java/org/kohsuke/github/GHPullRequestTest.java b/src/test/java/org/kohsuke/github/GHPullRequestTest.java
index 1ed8f0742b..1c985ce085 100644
--- a/src/test/java/org/kohsuke/github/GHPullRequestTest.java
+++ b/src/test/java/org/kohsuke/github/GHPullRequestTest.java
@@ -211,6 +211,106 @@ public void mergeCommitSHA() throws Exception {
         fail();
     }
 
+    @Test
+    public void setBaseBranch() throws Exception {
+        String prName = "testSetBaseBranch";
+        String originalBaseBranch = "master";
+        String newBaseBranch = "gh-pages";
+
+        GHPullRequest pullRequest = getRepository().createPullRequest(prName, "test/stable", "master", "## test");
+
+        assertEquals("Pull request base branch is supposed to be " + originalBaseBranch,
+                originalBaseBranch,
+                pullRequest.getBase().getRef());
+
+        GHPullRequest responsePullRequest = pullRequest.setBaseBranch(newBaseBranch);
+
+        assertEquals("Pull request base branch is supposed to be " + newBaseBranch,
+                newBaseBranch,
+                responsePullRequest.getBase().getRef());
+    }
+
+    @Test
+    public void setBaseBranchNonExisting() throws Exception {
+        String prName = "testSetBaseBranchNonExisting";
+        String originalBaseBranch = "master";
+        String newBaseBranch = "non-existing";
+
+        GHPullRequest pullRequest = getRepository().createPullRequest(prName, "test/stable", "master", "## test");
+
+        assertEquals("Pull request base branch is supposed to be " + originalBaseBranch,
+                originalBaseBranch,
+                pullRequest.getBase().getRef());
+
+        try {
+            pullRequest.setBaseBranch(newBaseBranch);
+        } catch (HttpException e) {
+            assertThat(e, instanceOf(HttpException.class));
+            assertThat(e.toString(), containsString("Proposed base branch 'non-existing' was not found"));
+        }
+
+        pullRequest.close();
+    }
+
+    @Test
+    public void updateOutdatedBranchesUnexpectedHead() throws Exception {
+        String prName = "testUpdateOutdatedBranches";
+        String outdatedRefName = "refs/heads/outdated";
+        GHRepository repository = gitHub.getOrganization("hub4j-test-org").getRepository("updateOutdatedBranches");
+
+        GHRef outdatedRef = repository.getRef(outdatedRefName);
+        outdatedRef.updateTo("6440189369f9f33b2366556a94dbc26f2cfdd969", true);
+
+        GHPullRequest outdatedPullRequest = repository.createPullRequest(prName, "outdated", "master", "## test");
+
+        do {
+            Thread.sleep(5000);
+            outdatedPullRequest.refresh();
+        } while (outdatedPullRequest.getMergeableState().equalsIgnoreCase("unknown"));
+
+        assertEquals("Pull request is supposed to be not up to date",
+                "behind",
+                outdatedPullRequest.getMergeableState());
+
+        outdatedRef.updateTo("f567328eb81270487864963b7d7446953353f2b5", true);
+
+        try {
+            outdatedPullRequest.updateBranch();
+        } catch (HttpException e) {
+            assertThat(e, instanceOf(HttpException.class));
+            assertThat(e.toString(), containsString("expected head sha didn’t match current head ref."));
+        }
+
+        outdatedPullRequest.close();
+    }
+
+    @Test
+    public void updateOutdatedBranches() throws Exception {
+        String prName = "testUpdateOutdatedBranches";
+        String outdatedRefName = "refs/heads/outdated";
+        GHRepository repository = gitHub.getOrganization("hub4j-test-org").getRepository("updateOutdatedBranches");
+
+        repository.getRef(outdatedRefName).updateTo("6440189369f9f33b2366556a94dbc26f2cfdd969", true);
+
+        GHPullRequest outdatedPullRequest = repository.createPullRequest(prName, "outdated", "master", "## test");
+
+        do {
+            Thread.sleep(5000);
+            outdatedPullRequest.refresh();
+        } while (outdatedPullRequest.getMergeableState().equalsIgnoreCase("unknown"));
+
+        assertEquals("Pull request is supposed to be not up to date",
+                "behind",
+                outdatedPullRequest.getMergeableState());
+
+        outdatedPullRequest.updateBranch();
+        outdatedPullRequest.refresh();
+
+        assertNotEquals("Pull request is supposed to be up to date", "behind", outdatedPullRequest.getMergeableState());
+
+        outdatedPullRequest.close();
+    }
+
     @Test
     public void squashMerge() throws Exception {
         String name = "squashMerge";
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/__files/orgs_hub4j-test-org-1.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/__files/orgs_hub4j-test-org-1.json
new file mode 100644
index 0000000000..7d3839a85a
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/__files/orgs_hub4j-test-org-1.json
@@ -0,0 +1,47 @@
+{
+  "login": "hub4j-test-org",
+  "id": 7544739,
+  "node_id": "MDEyOk9yZ2FuaXphdGlvbjc1NDQ3Mzk=",
+  "url": "https://api.github.com/orgs/hub4j-test-org",
+  "repos_url": "https://api.github.com/orgs/hub4j-test-org/repos",
+  "events_url": "https://api.github.com/orgs/hub4j-test-org/events",
+  "hooks_url": "https://api.github.com/orgs/hub4j-test-org/hooks",
+  "issues_url": "https://api.github.com/orgs/hub4j-test-org/issues",
+  "members_url": "https://api.github.com/orgs/hub4j-test-org/members{/member}",
+  "public_members_url": "https://api.github.com/orgs/hub4j-test-org/public_members{/member}",
+  "avatar_url": "https://avatars3.githubusercontent.com/u/7544739?v=4",
+  "description": "Hub4j Test Org Description (this could be null or blank too)",
+  "name": "Hub4j Test Org Name (this could be null or blank too)",
+  "company": null,
+  "blog": "https://hub4j.url.io/could/be/null",
+  "location": "Hub4j Test Org Location (this could be null or blank too)",
+  "email": "hub4jtestorgemail@could.be.null.com",
+  "twitter_username": null,
+  "is_verified": false,
+  "has_organization_projects": true,
+  "has_repository_projects": true,
+  "public_repos": 13,
+  "public_gists": 0,
+  "followers": 0,
+  "following": 0,
+  "html_url": "https://github.com/hub4j-test-org",
+  "created_at": "2014-05-10T19:39:11Z",
+  "updated_at": "2020-06-04T05:56:10Z",
+  "type": "Organization",
+  "total_private_repos": 0,
+  "owned_private_repos": 0,
+  "private_gists": 0,
+  "disk_usage": 149,
+  "collaborators": 0,
+  "billing_email": "kk@kohsuke.org",
+  "default_repository_permission": "none",
+  "members_can_create_repositories": false,
+  "two_factor_requirement_enabled": false,
+  "plan": {
+    "name": "free",
+    "space": 976562499,
+    "private_repos": 10000,
+    "filled_seats": 18,
+    "seats": 3
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/__files/repos_hub4j-test-org_github-api-2.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/__files/repos_hub4j-test-org_github-api-2.json
new file mode 100644
index 0000000000..6488d9c479
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/__files/repos_hub4j-test-org_github-api-2.json
@@ -0,0 +1,332 @@
+{
+  "id": 206888201,
+  "node_id": "MDEwOlJlcG9zaXRvcnkyMDY4ODgyMDE=",
+  "name": "github-api",
+  "full_name": "hub4j-test-org/github-api",
+  "private": false,
+  "owner": {
+    "login": "hub4j-test-org",
+    "id": 7544739,
+    "node_id": "MDEyOk9yZ2FuaXphdGlvbjc1NDQ3Mzk=",
+    "avatar_url": "https://avatars3.githubusercontent.com/u/7544739?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/hub4j-test-org",
+    "html_url": "https://github.com/hub4j-test-org",
+    "followers_url": "https://api.github.com/users/hub4j-test-org/followers",
+    "following_url": "https://api.github.com/users/hub4j-test-org/following{/other_user}",
+    "gists_url": "https://api.github.com/users/hub4j-test-org/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/hub4j-test-org/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/hub4j-test-org/subscriptions",
+    "organizations_url": "https://api.github.com/users/hub4j-test-org/orgs",
+    "repos_url": "https://api.github.com/users/hub4j-test-org/repos",
+    "events_url": "https://api.github.com/users/hub4j-test-org/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/hub4j-test-org/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "html_url": "https://github.com/hub4j-test-org/github-api",
+  "description": "Resetting",
+  "fork": true,
+  "url": "https://api.github.com/repos/hub4j-test-org/github-api",
+  "forks_url": "https://api.github.com/repos/hub4j-test-org/github-api/forks",
+  "keys_url": "https://api.github.com/repos/hub4j-test-org/github-api/keys{/key_id}",
+  "collaborators_url": "https://api.github.com/repos/hub4j-test-org/github-api/collaborators{/collaborator}",
+  "teams_url": "https://api.github.com/repos/hub4j-test-org/github-api/teams",
+  "hooks_url": "https://api.github.com/repos/hub4j-test-org/github-api/hooks",
+  "issue_events_url": "https://api.github.com/repos/hub4j-test-org/github-api/issues/events{/number}",
+  "events_url": "https://api.github.com/repos/hub4j-test-org/github-api/events",
+  "assignees_url": "https://api.github.com/repos/hub4j-test-org/github-api/assignees{/user}",
+  "branches_url": "https://api.github.com/repos/hub4j-test-org/github-api/branches{/branch}",
+  "tags_url": "https://api.github.com/repos/hub4j-test-org/github-api/tags",
+  "blobs_url": "https://api.github.com/repos/hub4j-test-org/github-api/git/blobs{/sha}",
+  "git_tags_url": "https://api.github.com/repos/hub4j-test-org/github-api/git/tags{/sha}",
+  "git_refs_url": "https://api.github.com/repos/hub4j-test-org/github-api/git/refs{/sha}",
+  "trees_url": "https://api.github.com/repos/hub4j-test-org/github-api/git/trees{/sha}",
+  "statuses_url": "https://api.github.com/repos/hub4j-test-org/github-api/statuses/{sha}",
+  "languages_url": "https://api.github.com/repos/hub4j-test-org/github-api/languages",
+  "stargazers_url": "https://api.github.com/repos/hub4j-test-org/github-api/stargazers",
+  "contributors_url": "https://api.github.com/repos/hub4j-test-org/github-api/contributors",
+  "subscribers_url": "https://api.github.com/repos/hub4j-test-org/github-api/subscribers",
+  "subscription_url": "https://api.github.com/repos/hub4j-test-org/github-api/subscription",
+  "commits_url": "https://api.github.com/repos/hub4j-test-org/github-api/commits{/sha}",
+  "git_commits_url": "https://api.github.com/repos/hub4j-test-org/github-api/git/commits{/sha}",
+  "comments_url": "https://api.github.com/repos/hub4j-test-org/github-api/comments{/number}",
+  "issue_comment_url": "https://api.github.com/repos/hub4j-test-org/github-api/issues/comments{/number}",
+  "contents_url": "https://api.github.com/repos/hub4j-test-org/github-api/contents/{+path}",
+  "compare_url": "https://api.github.com/repos/hub4j-test-org/github-api/compare/{base}...{head}",
+  "merges_url": "https://api.github.com/repos/hub4j-test-org/github-api/merges",
+  "archive_url": "https://api.github.com/repos/hub4j-test-org/github-api/{archive_format}{/ref}",
+  "downloads_url": "https://api.github.com/repos/hub4j-test-org/github-api/downloads",
+  "issues_url": "https://api.github.com/repos/hub4j-test-org/github-api/issues{/number}",
+  "pulls_url": "https://api.github.com/repos/hub4j-test-org/github-api/pulls{/number}",
+  "milestones_url": "https://api.github.com/repos/hub4j-test-org/github-api/milestones{/number}",
+  "notifications_url": "https://api.github.com/repos/hub4j-test-org/github-api/notifications{?since,all,participating}",
+  "labels_url": "https://api.github.com/repos/hub4j-test-org/github-api/labels{/name}",
+  "releases_url": "https://api.github.com/repos/hub4j-test-org/github-api/releases{/id}",
+  "deployments_url": "https://api.github.com/repos/hub4j-test-org/github-api/deployments",
+  "created_at": "2019-09-06T23:26:04Z",
+  "updated_at": "2020-06-10T23:27:59Z",
+  "pushed_at": "2020-09-03T19:05:11Z",
+  "git_url": "git://github.com/hub4j-test-org/github-api.git",
+  "ssh_url": "git@github.com:hub4j-test-org/github-api.git",
+  "clone_url": "https://github.com/hub4j-test-org/github-api.git",
+  "svn_url": "https://github.com/hub4j-test-org/github-api",
+  "homepage": "http://github-api.kohsuke.org/",
+  "size": 19052,
+  "stargazers_count": 0,
+  "watchers_count": 0,
+  "language": "Java",
+  "has_issues": true,
+  "has_projects": true,
+  "has_downloads": true,
+  "has_wiki": true,
+  "has_pages": false,
+  "forks_count": 0,
+  "mirror_url": null,
+  "archived": false,
+  "disabled": false,
+  "open_issues_count": 5,
+  "license": {
+    "key": "mit",
+    "name": "MIT License",
+    "spdx_id": "MIT",
+    "url": "https://api.github.com/licenses/mit",
+    "node_id": "MDc6TGljZW5zZTEz"
+  },
+  "forks": 0,
+  "open_issues": 5,
+  "watchers": 0,
+  "default_branch": "master",
+  "permissions": {
+    "admin": true,
+    "push": true,
+    "pull": true
+  },
+  "temp_clone_token": "",
+  "allow_squash_merge": true,
+  "allow_merge_commit": true,
+  "allow_rebase_merge": true,
+  "delete_branch_on_merge": false,
+  "organization": {
+    "login": "hub4j-test-org",
+    "id": 7544739,
+    "node_id": "MDEyOk9yZ2FuaXphdGlvbjc1NDQ3Mzk=",
+    "avatar_url": "https://avatars3.githubusercontent.com/u/7544739?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/hub4j-test-org",
+    "html_url": "https://github.com/hub4j-test-org",
+    "followers_url": "https://api.github.com/users/hub4j-test-org/followers",
+    "following_url": "https://api.github.com/users/hub4j-test-org/following{/other_user}",
+    "gists_url": "https://api.github.com/users/hub4j-test-org/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/hub4j-test-org/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/hub4j-test-org/subscriptions",
+    "organizations_url": "https://api.github.com/users/hub4j-test-org/orgs",
+    "repos_url": "https://api.github.com/users/hub4j-test-org/repos",
+    "events_url": "https://api.github.com/users/hub4j-test-org/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/hub4j-test-org/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "parent": {
+    "id": 617210,
+    "node_id": "MDEwOlJlcG9zaXRvcnk2MTcyMTA=",
+    "name": "github-api",
+    "full_name": "hub4j/github-api",
+    "private": false,
+    "owner": {
+      "login": "hub4j",
+      "id": 54909825,
+      "node_id": "MDEyOk9yZ2FuaXphdGlvbjU0OTA5ODI1",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/54909825?v=4",
+      "gravatar_id": "",
+      "url": "https://api.github.com/users/hub4j",
+      "html_url": "https://github.com/hub4j",
+      "followers_url": "https://api.github.com/users/hub4j/followers",
+      "following_url": "https://api.github.com/users/hub4j/following{/other_user}",
+      "gists_url": "https://api.github.com/users/hub4j/gists{/gist_id}",
+      "starred_url": "https://api.github.com/users/hub4j/starred{/owner}{/repo}",
+      "subscriptions_url": "https://api.github.com/users/hub4j/subscriptions",
+      "organizations_url": "https://api.github.com/users/hub4j/orgs",
+      "repos_url": "https://api.github.com/users/hub4j/repos",
+      "events_url": "https://api.github.com/users/hub4j/events{/privacy}",
+      "received_events_url": "https://api.github.com/users/hub4j/received_events",
+      "type": "Organization",
+      "site_admin": false
+    },
+    "html_url": "https://github.com/hub4j/github-api",
+    "description": "Java API for GitHub",
+    "fork": false,
+    "url": "https://api.github.com/repos/hub4j/github-api",
+    "forks_url": "https://api.github.com/repos/hub4j/github-api/forks",
+    "keys_url": "https://api.github.com/repos/hub4j/github-api/keys{/key_id}",
+    "collaborators_url": "https://api.github.com/repos/hub4j/github-api/collaborators{/collaborator}",
+    "teams_url": "https://api.github.com/repos/hub4j/github-api/teams",
+    "hooks_url": "https://api.github.com/repos/hub4j/github-api/hooks",
+    "issue_events_url": "https://api.github.com/repos/hub4j/github-api/issues/events{/number}",
+    "events_url": "https://api.github.com/repos/hub4j/github-api/events",
+    "assignees_url": "https://api.github.com/repos/hub4j/github-api/assignees{/user}",
+    "branches_url": "https://api.github.com/repos/hub4j/github-api/branches{/branch}",
+    "tags_url": "https://api.github.com/repos/hub4j/github-api/tags",
+    "blobs_url": "https://api.github.com/repos/hub4j/github-api/git/blobs{/sha}",
+    "git_tags_url": "https://api.github.com/repos/hub4j/github-api/git/tags{/sha}",
+    "git_refs_url": "https://api.github.com/repos/hub4j/github-api/git/refs{/sha}",
+    "trees_url": "https://api.github.com/repos/hub4j/github-api/git/trees{/sha}",
+    "statuses_url": "https://api.github.com/repos/hub4j/github-api/statuses/{sha}",
+    "languages_url": "https://api.github.com/repos/hub4j/github-api/languages",
+    "stargazers_url": "https://api.github.com/repos/hub4j/github-api/stargazers",
+    "contributors_url": "https://api.github.com/repos/hub4j/github-api/contributors",
+    "subscribers_url": "https://api.github.com/repos/hub4j/github-api/subscribers",
+    "subscription_url": "https://api.github.com/repos/hub4j/github-api/subscription",
+    "commits_url": "https://api.github.com/repos/hub4j/github-api/commits{/sha}",
+    "git_commits_url": "https://api.github.com/repos/hub4j/github-api/git/commits{/sha}",
+    "comments_url": "https://api.github.com/repos/hub4j/github-api/comments{/number}",
+    "issue_comment_url": "https://api.github.com/repos/hub4j/github-api/issues/comments{/number}",
+    "contents_url": "https://api.github.com/repos/hub4j/github-api/contents/{+path}",
+    "compare_url": "https://api.github.com/repos/hub4j/github-api/compare/{base}...{head}",
+    "merges_url": "https://api.github.com/repos/hub4j/github-api/merges",
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/__files/repos_hub4j-test-org_github-api_pulls-3.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/__files/repos_hub4j-test-org_github-api_pulls-3.json
new file mode 100644
index 0000000000..c640e08721
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/__files/repos_hub4j-test-org_github-api_pulls-3.json
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/__files/repos_hub4j-test-org_github-api_pulls_382-4.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/__files/repos_hub4j-test-org_github-api_pulls_382-4.json
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index 0000000000..99967a1bed
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+        "organizations_url": "https://api.github.com/users/hub4j-test-org/orgs",
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+        "received_events_url": "https://api.github.com/users/hub4j-test-org/received_events",
+        "type": "Organization",
+        "site_admin": false
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+      "html_url": "https://github.com/hub4j-test-org/github-api",
+      "description": "Resetting",
+      "fork": true,
+      "url": "https://api.github.com/repos/hub4j-test-org/github-api",
+      "forks_url": "https://api.github.com/repos/hub4j-test-org/github-api/forks",
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+      "hooks_url": "https://api.github.com/repos/hub4j-test-org/github-api/hooks",
+      "issue_events_url": "https://api.github.com/repos/hub4j-test-org/github-api/issues/events{/number}",
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+      "assignees_url": "https://api.github.com/repos/hub4j-test-org/github-api/assignees{/user}",
+      "branches_url": "https://api.github.com/repos/hub4j-test-org/github-api/branches{/branch}",
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+      "trees_url": "https://api.github.com/repos/hub4j-test-org/github-api/git/trees{/sha}",
+      "statuses_url": "https://api.github.com/repos/hub4j-test-org/github-api/statuses/{sha}",
+      "languages_url": "https://api.github.com/repos/hub4j-test-org/github-api/languages",
+      "stargazers_url": "https://api.github.com/repos/hub4j-test-org/github-api/stargazers",
+      "contributors_url": "https://api.github.com/repos/hub4j-test-org/github-api/contributors",
+      "subscribers_url": "https://api.github.com/repos/hub4j-test-org/github-api/subscribers",
+      "subscription_url": "https://api.github.com/repos/hub4j-test-org/github-api/subscription",
+      "commits_url": "https://api.github.com/repos/hub4j-test-org/github-api/commits{/sha}",
+      "git_commits_url": "https://api.github.com/repos/hub4j-test-org/github-api/git/commits{/sha}",
+      "comments_url": "https://api.github.com/repos/hub4j-test-org/github-api/comments{/number}",
+      "issue_comment_url": "https://api.github.com/repos/hub4j-test-org/github-api/issues/comments{/number}",
+      "contents_url": "https://api.github.com/repos/hub4j-test-org/github-api/contents/{+path}",
+      "compare_url": "https://api.github.com/repos/hub4j-test-org/github-api/compare/{base}...{head}",
+      "merges_url": "https://api.github.com/repos/hub4j-test-org/github-api/merges",
+      "archive_url": "https://api.github.com/repos/hub4j-test-org/github-api/{archive_format}{/ref}",
+      "downloads_url": "https://api.github.com/repos/hub4j-test-org/github-api/downloads",
+      "issues_url": "https://api.github.com/repos/hub4j-test-org/github-api/issues{/number}",
+      "pulls_url": "https://api.github.com/repos/hub4j-test-org/github-api/pulls{/number}",
+      "milestones_url": "https://api.github.com/repos/hub4j-test-org/github-api/milestones{/number}",
+      "notifications_url": "https://api.github.com/repos/hub4j-test-org/github-api/notifications{?since,all,participating}",
+      "labels_url": "https://api.github.com/repos/hub4j-test-org/github-api/labels{/name}",
+      "releases_url": "https://api.github.com/repos/hub4j-test-org/github-api/releases{/id}",
+      "deployments_url": "https://api.github.com/repos/hub4j-test-org/github-api/deployments",
+      "created_at": "2019-09-06T23:26:04Z",
+      "updated_at": "2020-06-10T23:27:59Z",
+      "pushed_at": "2020-09-03T19:05:17Z",
+      "git_url": "git://github.com/hub4j-test-org/github-api.git",
+      "ssh_url": "git@github.com:hub4j-test-org/github-api.git",
+      "clone_url": "https://github.com/hub4j-test-org/github-api.git",
+      "svn_url": "https://github.com/hub4j-test-org/github-api",
+      "homepage": "http://github-api.kohsuke.org/",
+      "size": 19052,
+      "stargazers_count": 0,
+      "watchers_count": 0,
+      "language": "Java",
+      "has_issues": true,
+      "has_projects": true,
+      "has_downloads": true,
+      "has_wiki": true,
+      "has_pages": false,
+      "forks_count": 0,
+      "mirror_url": null,
+      "archived": false,
+      "disabled": false,
+      "open_issues_count": 5,
+      "license": {
+        "key": "mit",
+        "name": "MIT License",
+        "spdx_id": "MIT",
+        "url": "https://api.github.com/licenses/mit",
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+      "open_issues": 5,
+      "watchers": 0,
+      "default_branch": "master"
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+    },
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+      "href": "https://github.com/hub4j-test-org/github-api/pull/382"
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+      "href": "https://api.github.com/repos/hub4j-test-org/github-api/issues/382/comments"
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+      "href": "https://api.github.com/repos/hub4j-test-org/github-api/pulls/382/comments"
+    },
+    "review_comment": {
+      "href": "https://api.github.com/repos/hub4j-test-org/github-api/pulls/comments{/number}"
+    },
+    "commits": {
+      "href": "https://api.github.com/repos/hub4j-test-org/github-api/pulls/382/commits"
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+    "statuses": {
+      "href": "https://api.github.com/repos/hub4j-test-org/github-api/statuses/1f40fdf4acf1adb246c109c21a22f617e4bd1ca8"
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/mappings/orgs_hub4j-test-org-1.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/mappings/orgs_hub4j-test-org-1.json
new file mode 100644
index 0000000000..51ee7a9f19
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/mappings/orgs_hub4j-test-org-1.json
@@ -0,0 +1,46 @@
+{
+  "id": "40fe5545-9264-4abb-9cab-71c7a5b37c52",
+  "name": "orgs_hub4j-test-org",
+  "request": {
+    "url": "/orgs/hub4j-test-org",
+    "method": "GET",
+    "headers": {
+      "Accept": {
+        "equalTo": "text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "orgs_hub4j-test-org-1.json",
+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:15 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "200 OK",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding, Accept, X-Requested-With",
+        "Accept-Encoding"
+      ],
+      "ETag": "W/\"ea860001e36aab2981aba60cd49099af\"",
+      "Last-Modified": "Thu, 04 Jun 2020 05:56:10 GMT",
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+      "X-RateLimit-Limit": "5000",
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+      "X-RateLimit-Reset": "1599161295",
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+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
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+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
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+      "X-GitHub-Request-Id": "C854:5E45:B304F97:D8254A3:5F513E6B"
+    }
+  },
+  "uuid": "40fe5545-9264-4abb-9cab-71c7a5b37c52",
+  "persistent": true,
+  "insertionIndex": 1
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/mappings/repos_hub4j-test-org_github-api-2.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/mappings/repos_hub4j-test-org_github-api-2.json
new file mode 100644
index 0000000000..aff8f6aa31
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/mappings/repos_hub4j-test-org_github-api-2.json
@@ -0,0 +1,46 @@
+{
+  "id": "e8734346-0815-4895-8d0c-99b4808df22c",
+  "name": "repos_hub4j-test-org_github-api",
+  "request": {
+    "url": "/repos/hub4j-test-org/github-api",
+    "method": "GET",
+    "headers": {
+      "Accept": {
+        "equalTo": "text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "repos_hub4j-test-org_github-api-2.json",
+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:16 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "200 OK",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding, Accept, X-Requested-With",
+        "Accept-Encoding"
+      ],
+      "ETag": "W/\"f27d2455c716470093a73afb89734afd\"",
+      "Last-Modified": "Wed, 10 Jun 2020 23:27:59 GMT",
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+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
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+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "C854:5E45:B304FE3:D8254E1:5F513E6B"
+    }
+  },
+  "uuid": "e8734346-0815-4895-8d0c-99b4808df22c",
+  "persistent": true,
+  "insertionIndex": 2
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/mappings/repos_hub4j-test-org_github-api_pulls-3.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/mappings/repos_hub4j-test-org_github-api_pulls-3.json
new file mode 100644
index 0000000000..548504deab
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/mappings/repos_hub4j-test-org_github-api_pulls-3.json
@@ -0,0 +1,53 @@
+{
+  "id": "c873b298-53af-4eaa-8081-fd4bdb624a9c",
+  "name": "repos_hub4j-test-org_github-api_pulls",
+  "request": {
+    "url": "/repos/hub4j-test-org/github-api/pulls",
+    "method": "POST",
+    "headers": {
+      "Accept": {
+        "equalTo": "application/vnd.github.shadow-cat-preview+json"
+      }
+    },
+    "bodyPatterns": [
+      {
+        "equalToJson": "{\"head\":\"test/stable\",\"draft\":false,\"maintainer_can_modify\":true,\"title\":\"testSetBaseBranch\",\"body\":\"## test\",\"base\":\"master\"}",
+        "ignoreArrayOrder": true,
+        "ignoreExtraElements": false
+      }
+    ]
+  },
+  "response": {
+    "status": 201,
+    "bodyFileName": "repos_hub4j-test-org_github-api_pulls-3.json",
+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:17 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "201 Created",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding, Accept, X-Requested-With",
+        "Accept-Encoding"
+      ],
+      "ETag": "\"8641f2585239d74c44c1bb85ec9e74b2\"",
+      "Location": "https://api.github.com/repos/hub4j-test-org/github-api/pulls/382",
+      "X-GitHub-Media-Type": "github.v3; param=shadow-cat-preview; format=json",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4685",
+      "X-RateLimit-Reset": "1599161295",
+      "X-RateLimit-Used": "315",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "C854:5E45:B305038:D82554B:5F513E6C"
+    }
+  },
+  "uuid": "c873b298-53af-4eaa-8081-fd4bdb624a9c",
+  "persistent": true,
+  "insertionIndex": 3
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/mappings/repos_hub4j-test-org_github-api_pulls_382-4.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/mappings/repos_hub4j-test-org_github-api_pulls_382-4.json
new file mode 100644
index 0000000000..a9bc819b8f
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranch/mappings/repos_hub4j-test-org_github-api_pulls_382-4.json
@@ -0,0 +1,52 @@
+{
+  "id": "586e28d1-fa1e-4182-bd02-3b87cb4b8ca6",
+  "name": "repos_hub4j-test-org_github-api_pulls_382",
+  "request": {
+    "url": "/repos/hub4j-test-org/github-api/pulls/382",
+    "method": "PATCH",
+    "headers": {
+      "Accept": {
+        "equalTo": "text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2"
+      }
+    },
+    "bodyPatterns": [
+      {
+        "equalToJson": "{\"base\":\"gh-pages\"}",
+        "ignoreArrayOrder": true,
+        "ignoreExtraElements": false
+      }
+    ]
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "repos_hub4j-test-org_github-api_pulls_382-4.json",
+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:18 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "200 OK",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding, Accept, X-Requested-With",
+        "Accept-Encoding"
+      ],
+      "ETag": "W/\"93324937ab36aaa1004ca898abca48e0\"",
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+      "X-RateLimit-Reset": "1599161295",
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+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "C854:5E45:B305146:D825675:5F513E6D"
+    }
+  },
+  "uuid": "586e28d1-fa1e-4182-bd02-3b87cb4b8ca6",
+  "persistent": true,
+  "insertionIndex": 4
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/__files/orgs_hub4j-test-org-1.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/__files/orgs_hub4j-test-org-1.json
new file mode 100644
index 0000000000..7d3839a85a
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/__files/orgs_hub4j-test-org-1.json
@@ -0,0 +1,47 @@
+{
+  "login": "hub4j-test-org",
+  "id": 7544739,
+  "node_id": "MDEyOk9yZ2FuaXphdGlvbjc1NDQ3Mzk=",
+  "url": "https://api.github.com/orgs/hub4j-test-org",
+  "repos_url": "https://api.github.com/orgs/hub4j-test-org/repos",
+  "events_url": "https://api.github.com/orgs/hub4j-test-org/events",
+  "hooks_url": "https://api.github.com/orgs/hub4j-test-org/hooks",
+  "issues_url": "https://api.github.com/orgs/hub4j-test-org/issues",
+  "members_url": "https://api.github.com/orgs/hub4j-test-org/members{/member}",
+  "public_members_url": "https://api.github.com/orgs/hub4j-test-org/public_members{/member}",
+  "avatar_url": "https://avatars3.githubusercontent.com/u/7544739?v=4",
+  "description": "Hub4j Test Org Description (this could be null or blank too)",
+  "name": "Hub4j Test Org Name (this could be null or blank too)",
+  "company": null,
+  "blog": "https://hub4j.url.io/could/be/null",
+  "location": "Hub4j Test Org Location (this could be null or blank too)",
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+  "twitter_username": null,
+  "is_verified": false,
+  "has_organization_projects": true,
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/__files/repos_hub4j-test-org_github-api-2.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/__files/repos_hub4j-test-org_github-api-2.json
new file mode 100644
index 0000000000..dd92bb7d66
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/__files/repos_hub4j-test-org_github-api-2.json
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/__files/repos_hub4j-test-org_github-api_pulls-3.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/__files/repos_hub4j-test-org_github-api_pulls-3.json
new file mode 100644
index 0000000000..ac7becda89
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+      "href": "https://api.github.com/repos/hub4j-test-org/github-api/pulls/381/comments"
+    },
+    "review_comment": {
+      "href": "https://api.github.com/repos/hub4j-test-org/github-api/pulls/comments{/number}"
+    },
+    "commits": {
+      "href": "https://api.github.com/repos/hub4j-test-org/github-api/pulls/381/commits"
+    },
+    "statuses": {
+      "href": "https://api.github.com/repos/hub4j-test-org/github-api/statuses/1f40fdf4acf1adb246c109c21a22f617e4bd1ca8"
+    }
+  },
+  "author_association": "MEMBER",
+  "active_lock_reason": null,
+  "merged": false,
+  "mergeable": true,
+  "rebaseable": true,
+  "mergeable_state": "unstable",
+  "merged_by": null,
+  "comments": 0,
+  "review_comments": 0,
+  "maintainer_can_modify": false,
+  "commits": 2,
+  "additions": 2,
+  "deletions": 1,
+  "changed_files": 1
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/mappings/orgs_hub4j-test-org-1.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/mappings/orgs_hub4j-test-org-1.json
new file mode 100644
index 0000000000..557acd04df
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/mappings/orgs_hub4j-test-org-1.json
@@ -0,0 +1,46 @@
+{
+  "id": "fea7c6c6-2f75-46b0-bbf2-2207feaaf8ee",
+  "name": "orgs_hub4j-test-org",
+  "request": {
+    "url": "/orgs/hub4j-test-org",
+    "method": "GET",
+    "headers": {
+      "Accept": {
+        "equalTo": "text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "orgs_hub4j-test-org-1.json",
+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:10 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "200 OK",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding, Accept, X-Requested-With",
+        "Accept-Encoding"
+      ],
+      "ETag": "W/\"ea860001e36aab2981aba60cd49099af\"",
+      "Last-Modified": "Thu, 04 Jun 2020 05:56:10 GMT",
+      "X-GitHub-Media-Type": "unknown, github.v3",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4697",
+      "X-RateLimit-Reset": "1599161295",
+      "X-RateLimit-Used": "303",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "C84A:2C9E:13F9DBF9:18306244:5F513E65"
+    }
+  },
+  "uuid": "fea7c6c6-2f75-46b0-bbf2-2207feaaf8ee",
+  "persistent": true,
+  "insertionIndex": 1
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/mappings/repos_hub4j-test-org_github-api-2.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/mappings/repos_hub4j-test-org_github-api-2.json
new file mode 100644
index 0000000000..999af31b9f
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/mappings/repos_hub4j-test-org_github-api-2.json
@@ -0,0 +1,46 @@
+{
+  "id": "a210a048-c699-47a6-96ee-d035a23829f3",
+  "name": "repos_hub4j-test-org_github-api",
+  "request": {
+    "url": "/repos/hub4j-test-org/github-api",
+    "method": "GET",
+    "headers": {
+      "Accept": {
+        "equalTo": "text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "repos_hub4j-test-org_github-api-2.json",
+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:10 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "200 OK",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding, Accept, X-Requested-With",
+        "Accept-Encoding"
+      ],
+      "ETag": "W/\"8a305768b888ec9b150f28e113a133ca\"",
+      "Last-Modified": "Wed, 10 Jun 2020 23:27:59 GMT",
+      "X-GitHub-Media-Type": "unknown, github.v3",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4696",
+      "X-RateLimit-Reset": "1599161295",
+      "X-RateLimit-Used": "304",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "C84A:2C9E:13F9DCB6:183062AC:5F513E66"
+    }
+  },
+  "uuid": "a210a048-c699-47a6-96ee-d035a23829f3",
+  "persistent": true,
+  "insertionIndex": 2
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/mappings/repos_hub4j-test-org_github-api_pulls-3.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/mappings/repos_hub4j-test-org_github-api_pulls-3.json
new file mode 100644
index 0000000000..0f87464569
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/mappings/repos_hub4j-test-org_github-api_pulls-3.json
@@ -0,0 +1,53 @@
+{
+  "id": "a6a18e14-ce7c-45f7-9164-86da4bf75ef4",
+  "name": "repos_hub4j-test-org_github-api_pulls",
+  "request": {
+    "url": "/repos/hub4j-test-org/github-api/pulls",
+    "method": "POST",
+    "headers": {
+      "Accept": {
+        "equalTo": "application/vnd.github.shadow-cat-preview+json"
+      }
+    },
+    "bodyPatterns": [
+      {
+        "equalToJson": "{\"head\":\"test/stable\",\"draft\":false,\"maintainer_can_modify\":true,\"title\":\"testSetBaseBranchNonExisting\",\"body\":\"## test\",\"base\":\"master\"}",
+        "ignoreArrayOrder": true,
+        "ignoreExtraElements": false
+      }
+    ]
+  },
+  "response": {
+    "status": 201,
+    "bodyFileName": "repos_hub4j-test-org_github-api_pulls-3.json",
+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:11 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "201 Created",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding, Accept, X-Requested-With",
+        "Accept-Encoding"
+      ],
+      "ETag": "\"e5dae09961ee55c19f9643ad7b5ae02b\"",
+      "Location": "https://api.github.com/repos/hub4j-test-org/github-api/pulls/381",
+      "X-GitHub-Media-Type": "github.v3; param=shadow-cat-preview; format=json",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4695",
+      "X-RateLimit-Reset": "1599161295",
+      "X-RateLimit-Used": "305",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "C84A:2C9E:13F9DD37:18306399:5F513E66"
+    }
+  },
+  "uuid": "a6a18e14-ce7c-45f7-9164-86da4bf75ef4",
+  "persistent": true,
+  "insertionIndex": 3
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/mappings/repos_hub4j-test-org_github-api_pulls_381-4.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/mappings/repos_hub4j-test-org_github-api_pulls_381-4.json
new file mode 100644
index 0000000000..4e9373bdea
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/mappings/repos_hub4j-test-org_github-api_pulls_381-4.json
@@ -0,0 +1,46 @@
+{
+  "id": "d2d858b0-e83c-4424-970e-c395524b3334",
+  "name": "repos_hub4j-test-org_github-api_pulls_381",
+  "request": {
+    "url": "/repos/hub4j-test-org/github-api/pulls/381",
+    "method": "PATCH",
+    "headers": {
+      "Accept": {
+        "equalTo": "text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2"
+      }
+    },
+    "bodyPatterns": [
+      {
+        "equalToJson": "{\"base\":\"non-existing\"}",
+        "ignoreArrayOrder": true,
+        "ignoreExtraElements": false
+      }
+    ]
+  },
+  "response": {
+    "status": 422,
+    "body": "{\"message\":\"Validation Failed\",\"errors\":[{\"message\":\"Proposed base branch 'non-existing' was not found\",\"resource\":\"PullRequest\",\"field\":\"base\",\"code\":\"invalid\"}],\"documentation_url\":\"https://docs.github.com/rest/reference/pulls#update-a-pull-request\"}",
+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:12 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "422 Unprocessable Entity",
+      "X-GitHub-Media-Type": "unknown, github.v3",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4694",
+      "X-RateLimit-Reset": "1599161295",
+      "X-RateLimit-Used": "306",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Vary": "Accept-Encoding, Accept, X-Requested-With",
+      "X-GitHub-Request-Id": "C84A:2C9E:13F9DECA:18306565:5F513E67"
+    }
+  },
+  "uuid": "d2d858b0-e83c-4424-970e-c395524b3334",
+  "persistent": true,
+  "insertionIndex": 4
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/mappings/repos_hub4j-test-org_github-api_pulls_381-5.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/mappings/repos_hub4j-test-org_github-api_pulls_381-5.json
new file mode 100644
index 0000000000..625958a38a
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/setBaseBranchNonExisting/mappings/repos_hub4j-test-org_github-api_pulls_381-5.json
@@ -0,0 +1,52 @@
+{
+  "id": "a873c979-6c54-485b-902c-e7f885e1c1ea",
+  "name": "repos_hub4j-test-org_github-api_pulls_381",
+  "request": {
+    "url": "/repos/hub4j-test-org/github-api/pulls/381",
+    "method": "PATCH",
+    "headers": {
+      "Accept": {
+        "equalTo": "text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2"
+      }
+    },
+    "bodyPatterns": [
+      {
+        "equalToJson": "{\"state\":\"closed\"}",
+        "ignoreArrayOrder": true,
+        "ignoreExtraElements": false
+      }
+    ]
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "repos_hub4j-test-org_github-api_pulls_381-5.json",
+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:13 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "200 OK",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding, Accept, X-Requested-With",
+        "Accept-Encoding"
+      ],
+      "ETag": "W/\"eb425460cfd2a23d63a61cf58915487c\"",
+      "X-GitHub-Media-Type": "unknown, github.v3",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4693",
+      "X-RateLimit-Reset": "1599161295",
+      "X-RateLimit-Used": "307",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "C84A:2C9E:13F9DFB3:1830665E:5F513E68"
+    }
+  },
+  "uuid": "a873c979-6c54-485b-902c-e7f885e1c1ea",
+  "persistent": true,
+  "insertionIndex": 5
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/__files/orgs_hub4j-test-org-1.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/__files/orgs_hub4j-test-org-1.json
new file mode 100644
index 0000000000..7d3839a85a
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/__files/orgs_hub4j-test-org-1.json
@@ -0,0 +1,47 @@
+{
+  "login": "hub4j-test-org",
+  "id": 7544739,
+  "node_id": "MDEyOk9yZ2FuaXphdGlvbjc1NDQ3Mzk=",
+  "url": "https://api.github.com/orgs/hub4j-test-org",
+  "repos_url": "https://api.github.com/orgs/hub4j-test-org/repos",
+  "events_url": "https://api.github.com/orgs/hub4j-test-org/events",
+  "hooks_url": "https://api.github.com/orgs/hub4j-test-org/hooks",
+  "issues_url": "https://api.github.com/orgs/hub4j-test-org/issues",
+  "members_url": "https://api.github.com/orgs/hub4j-test-org/members{/member}",
+  "public_members_url": "https://api.github.com/orgs/hub4j-test-org/public_members{/member}",
+  "avatar_url": "https://avatars3.githubusercontent.com/u/7544739?v=4",
+  "description": "Hub4j Test Org Description (this could be null or blank too)",
+  "name": "Hub4j Test Org Name (this could be null or blank too)",
+  "company": null,
+  "blog": "https://hub4j.url.io/could/be/null",
+  "location": "Hub4j Test Org Location (this could be null or blank too)",
+  "email": "hub4jtestorgemail@could.be.null.com",
+  "twitter_username": null,
+  "is_verified": false,
+  "has_organization_projects": true,
+  "has_repository_projects": true,
+  "public_repos": 13,
+  "public_gists": 0,
+  "followers": 0,
+  "following": 0,
+  "html_url": "https://github.com/hub4j-test-org",
+  "created_at": "2014-05-10T19:39:11Z",
+  "updated_at": "2020-06-04T05:56:10Z",
+  "type": "Organization",
+  "total_private_repos": 0,
+  "owned_private_repos": 0,
+  "private_gists": 0,
+  "disk_usage": 149,
+  "collaborators": 0,
+  "billing_email": "kk@kohsuke.org",
+  "default_repository_permission": "none",
+  "members_can_create_repositories": false,
+  "two_factor_requirement_enabled": false,
+  "plan": {
+    "name": "free",
+    "space": 976562499,
+    "private_repos": 10000,
+    "filled_seats": 18,
+    "seats": 3
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/__files/repos_hub4j-test-org_updateoutdatedbranches-2.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/__files/repos_hub4j-test-org_updateoutdatedbranches-2.json
new file mode 100644
index 0000000000..77d2f7547c
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/__files/repos_hub4j-test-org_updateoutdatedbranches-2.json
@@ -0,0 +1,126 @@
+{
+  "id": 292640382,
+  "node_id": "MDEwOlJlcG9zaXRvcnkyOTI2NDAzODI=",
+  "name": "updateOutdatedBranches",
+  "full_name": "hub4j-test-org/updateOutdatedBranches",
+  "private": false,
+  "owner": {
+    "login": "hub4j-test-org",
+    "id": 7544739,
+    "node_id": "MDEyOk9yZ2FuaXphdGlvbjc1NDQ3Mzk=",
+    "avatar_url": "https://avatars3.githubusercontent.com/u/7544739?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/hub4j-test-org",
+    "html_url": "https://github.com/hub4j-test-org",
+    "followers_url": "https://api.github.com/users/hub4j-test-org/followers",
+    "following_url": "https://api.github.com/users/hub4j-test-org/following{/other_user}",
+    "gists_url": "https://api.github.com/users/hub4j-test-org/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/hub4j-test-org/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/hub4j-test-org/subscriptions",
+    "organizations_url": "https://api.github.com/users/hub4j-test-org/orgs",
+    "repos_url": "https://api.github.com/users/hub4j-test-org/repos",
+    "events_url": "https://api.github.com/users/hub4j-test-org/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/hub4j-test-org/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "html_url": "https://github.com/hub4j-test-org/updateOutdatedBranches",
+  "description": null,
+  "fork": false,
+  "url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches",
+  "forks_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/forks",
+  "keys_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/keys{/key_id}",
+  "collaborators_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/collaborators{/collaborator}",
+  "teams_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/teams",
+  "hooks_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/hooks",
+  "issue_events_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/issues/events{/number}",
+  "events_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/events",
+  "assignees_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/assignees{/user}",
+  "branches_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/branches{/branch}",
+  "tags_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/tags",
+  "blobs_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/git/blobs{/sha}",
+  "git_tags_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/git/tags{/sha}",
+  "git_refs_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/git/refs{/sha}",
+  "trees_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/git/trees{/sha}",
+  "statuses_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/statuses/{sha}",
+  "languages_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/languages",
+  "stargazers_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/stargazers",
+  "contributors_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/contributors",
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+  "subscription_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/subscription",
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/__files/repos_hub4j-test-org_updateoutdatedbranches_pulls_8-6.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/__files/repos_hub4j-test-org_updateoutdatedbranches_pulls_8-6.json
new file mode 100644
index 0000000000..3674c127a7
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/__files/repos_hub4j-test-org_updateoutdatedbranches_pulls_8-8.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/__files/repos_hub4j-test-org_updateoutdatedbranches_pulls_8-8.json
new file mode 100644
index 0000000000..84ea39a2c5
--- /dev/null
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/__files/repos_hub4j-test-org_updateoutdatedbranches_pulls_8-9.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/__files/repos_hub4j-test-org_updateoutdatedbranches_pulls_8-9.json
new file mode 100644
index 0000000000..50bb0a231e
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@@ -0,0 +1,46 @@
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/mappings/repos_hub4j-test-org_updateoutdatedbranches-2.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/mappings/repos_hub4j-test-org_updateoutdatedbranches-2.json
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@@ -0,0 +1,47 @@
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+      "X-GitHub-Request-Id": "C85C:B2ED:10165290:137C072D:5F513E72"
+    }
+  },
+  "uuid": "45378747-40bd-4399-912c-8c86743489f2",
+  "persistent": true,
+  "insertionIndex": 5
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_8-6.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_8-6.json
new file mode 100644
index 0000000000..3cd14baaab
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_8-6.json
@@ -0,0 +1,49 @@
+{
+  "id": "4de79e66-0c4b-4b2b-9563-a4f95dc3e7c6",
+  "name": "repos_hub4j-test-org_updateoutdatedbranches_pulls_8",
+  "request": {
+    "url": "/repos/hub4j-test-org/updateOutdatedBranches/pulls/8",
+    "method": "GET",
+    "headers": {
+      "Accept": {
+        "equalTo": "application/vnd.github.shadow-cat-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "repos_hub4j-test-org_updateoutdatedbranches_pulls_8-6.json",
+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:28 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "200 OK",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding, Accept, X-Requested-With",
+        "Accept-Encoding"
+      ],
+      "ETag": "W/\"27a94437c98063b8b4d43fbec0ac4327\"",
+      "Last-Modified": "Thu, 03 Sep 2020 19:05:22 GMT",
+      "X-GitHub-Media-Type": "github.v3; param=shadow-cat-preview; format=json",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4673",
+      "X-RateLimit-Reset": "1599161295",
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+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "C85C:B2ED:10165CE0:137C09B8:5F513E73"
+    }
+  },
+  "uuid": "4de79e66-0c4b-4b2b-9563-a4f95dc3e7c6",
+  "persistent": true,
+  "scenarioName": "scenario-1-repos-hub4j-test-org-updateOutdatedBranches-pulls-8",
+  "requiredScenarioState": "Started",
+  "newScenarioState": "scenario-1-repos-hub4j-test-org-updateOutdatedBranches-pulls-8-2",
+  "insertionIndex": 6
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_8-8.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_8-8.json
new file mode 100644
index 0000000000..10ba21bf18
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_8-8.json
@@ -0,0 +1,48 @@
+{
+  "id": "655967c4-5549-4484-8b59-8194f7241568",
+  "name": "repos_hub4j-test-org_updateoutdatedbranches_pulls_8",
+  "request": {
+    "url": "/repos/hub4j-test-org/updateOutdatedBranches/pulls/8",
+    "method": "GET",
+    "headers": {
+      "Accept": {
+        "equalTo": "application/vnd.github.shadow-cat-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "repos_hub4j-test-org_updateoutdatedbranches_pulls_8-8.json",
+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:30 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
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+        "Accept-Encoding, Accept, X-Requested-With",
+        "Accept-Encoding"
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+      "ETag": "W/\"11d0727b16cb6765ff2c18421fb449fb\"",
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+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "C85C:B2ED:1016605D:137C1803:5F513E7A"
+    }
+  },
+  "uuid": "655967c4-5549-4484-8b59-8194f7241568",
+  "persistent": true,
+  "scenarioName": "scenario-1-repos-hub4j-test-org-updateOutdatedBranches-pulls-8",
+  "requiredScenarioState": "scenario-1-repos-hub4j-test-org-updateOutdatedBranches-pulls-8-2",
+  "insertionIndex": 8
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_8-9.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_8-9.json
new file mode 100644
index 0000000000..30a93d73fd
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_8-9.json
@@ -0,0 +1,52 @@
+{
+  "id": "be58a6a0-6025-49d5-acae-51b25276bed0",
+  "name": "repos_hub4j-test-org_updateoutdatedbranches_pulls_8",
+  "request": {
+    "url": "/repos/hub4j-test-org/updateOutdatedBranches/pulls/8",
+    "method": "PATCH",
+    "headers": {
+      "Accept": {
+        "equalTo": "text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2"
+      }
+    },
+    "bodyPatterns": [
+      {
+        "equalToJson": "{\"state\":\"closed\"}",
+        "ignoreArrayOrder": true,
+        "ignoreExtraElements": false
+      }
+    ]
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "repos_hub4j-test-org_updateoutdatedbranches_pulls_8-9.json",
+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:31 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "200 OK",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding, Accept, X-Requested-With",
+        "Accept-Encoding"
+      ],
+      "ETag": "W/\"fcc21f5d9612a3fe09b8816f2f168889\"",
+      "X-GitHub-Media-Type": "unknown, github.v3",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4670",
+      "X-RateLimit-Reset": "1599161295",
+      "X-RateLimit-Used": "330",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "C85C:B2ED:101660EB:137C1902:5F513E7A"
+    }
+  },
+  "uuid": "be58a6a0-6025-49d5-acae-51b25276bed0",
+  "persistent": true,
+  "insertionIndex": 9
+}
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_8_update-branch-7.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_8_update-branch-7.json
new file mode 100644
index 0000000000..3a978491ed
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranches/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_8_update-branch-7.json
@@ -0,0 +1,47 @@
+{
+  "id": "8da7d3bd-9bd0-4c5d-9d52-19d4b0e9324c",
+  "name": "repos_hub4j-test-org_updateoutdatedbranches_pulls_8_update-branch",
+  "request": {
+    "url": "/repos/hub4j-test-org/updateOutdatedBranches/pulls/8/update-branch",
+    "method": "PUT",
+    "headers": {
+      "Accept": {
+        "equalTo": "application/vnd.github.lydian-preview+json"
+      }
+    },
+    "bodyPatterns": [
+      {
+        "equalToJson": "{\"expected_head_sha\":\"6440189369f9f33b2366556a94dbc26f2cfdd969\"}",
+        "ignoreArrayOrder": true,
+        "ignoreExtraElements": false
+      }
+    ]
+  },
+  "response": {
+    "status": 202,
+    "body": "{\"message\":\"Updating pull request branch.\",\"url\":\"https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/pulls/8\"}",
+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:30 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "202 Accepted",
+      "location": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/pulls/8",
+      "X-GitHub-Media-Type": "github.lydian-preview; format=json",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4672",
+      "X-RateLimit-Reset": "1599161295",
+      "X-RateLimit-Used": "328",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Vary": "Accept-Encoding, Accept, X-Requested-With",
+      "X-GitHub-Request-Id": "C85C:B2ED:10165DB6:137C14C1:5F513E78"
+    }
+  },
+  "uuid": "8da7d3bd-9bd0-4c5d-9d52-19d4b0e9324c",
+  "persistent": true,
+  "insertionIndex": 7
+}
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/__files/orgs_hub4j-test-org-1.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/__files/orgs_hub4j-test-org-1.json
new file mode 100644
index 0000000000..7d3839a85a
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/__files/orgs_hub4j-test-org-1.json
@@ -0,0 +1,47 @@
+{
+  "login": "hub4j-test-org",
+  "id": 7544739,
+  "node_id": "MDEyOk9yZ2FuaXphdGlvbjc1NDQ3Mzk=",
+  "url": "https://api.github.com/orgs/hub4j-test-org",
+  "repos_url": "https://api.github.com/orgs/hub4j-test-org/repos",
+  "events_url": "https://api.github.com/orgs/hub4j-test-org/events",
+  "hooks_url": "https://api.github.com/orgs/hub4j-test-org/hooks",
+  "issues_url": "https://api.github.com/orgs/hub4j-test-org/issues",
+  "members_url": "https://api.github.com/orgs/hub4j-test-org/members{/member}",
+  "public_members_url": "https://api.github.com/orgs/hub4j-test-org/public_members{/member}",
+  "avatar_url": "https://avatars3.githubusercontent.com/u/7544739?v=4",
+  "description": "Hub4j Test Org Description (this could be null or blank too)",
+  "name": "Hub4j Test Org Name (this could be null or blank too)",
+  "company": null,
+  "blog": "https://hub4j.url.io/could/be/null",
+  "location": "Hub4j Test Org Location (this could be null or blank too)",
+  "email": "hub4jtestorgemail@could.be.null.com",
+  "twitter_username": null,
+  "is_verified": false,
+  "has_organization_projects": true,
+  "has_repository_projects": true,
+  "public_repos": 13,
+  "public_gists": 0,
+  "followers": 0,
+  "following": 0,
+  "html_url": "https://github.com/hub4j-test-org",
+  "created_at": "2014-05-10T19:39:11Z",
+  "updated_at": "2020-06-04T05:56:10Z",
+  "type": "Organization",
+  "total_private_repos": 0,
+  "owned_private_repos": 0,
+  "private_gists": 0,
+  "disk_usage": 149,
+  "collaborators": 0,
+  "billing_email": "kk@kohsuke.org",
+  "default_repository_permission": "none",
+  "members_can_create_repositories": false,
+  "two_factor_requirement_enabled": false,
+  "plan": {
+    "name": "free",
+    "space": 976562499,
+    "private_repos": 10000,
+    "filled_seats": 18,
+    "seats": 3
+  }
+}
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/__files/repos_hub4j-test-org_updateoutdatedbranches-2.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/__files/repos_hub4j-test-org_updateoutdatedbranches-2.json
new file mode 100644
index 0000000000..c321e7b20d
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/__files/repos_hub4j-test-org_updateoutdatedbranches-2.json
@@ -0,0 +1,126 @@
+{
+  "id": 292640382,
+  "node_id": "MDEwOlJlcG9zaXRvcnkyOTI2NDAzODI=",
+  "name": "updateOutdatedBranches",
+  "full_name": "hub4j-test-org/updateOutdatedBranches",
+  "private": false,
+  "owner": {
+    "login": "hub4j-test-org",
+    "id": 7544739,
+    "node_id": "MDEyOk9yZ2FuaXphdGlvbjc1NDQ3Mzk=",
+    "avatar_url": "https://avatars3.githubusercontent.com/u/7544739?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/hub4j-test-org",
+    "html_url": "https://github.com/hub4j-test-org",
+    "followers_url": "https://api.github.com/users/hub4j-test-org/followers",
+    "following_url": "https://api.github.com/users/hub4j-test-org/following{/other_user}",
+    "gists_url": "https://api.github.com/users/hub4j-test-org/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/hub4j-test-org/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/hub4j-test-org/subscriptions",
+    "organizations_url": "https://api.github.com/users/hub4j-test-org/orgs",
+    "repos_url": "https://api.github.com/users/hub4j-test-org/repos",
+    "events_url": "https://api.github.com/users/hub4j-test-org/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/hub4j-test-org/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "html_url": "https://github.com/hub4j-test-org/updateOutdatedBranches",
+  "description": null,
+  "fork": false,
+  "url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches",
+  "forks_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/forks",
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+  "collaborators_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/collaborators{/collaborator}",
+  "teams_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/teams",
+  "hooks_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/hooks",
+  "issue_events_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/issues/events{/number}",
+  "events_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/events",
+  "assignees_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/assignees{/user}",
+  "branches_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/branches{/branch}",
+  "tags_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/tags",
+  "blobs_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/git/blobs{/sha}",
+  "git_tags_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/git/tags{/sha}",
+  "git_refs_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/git/refs{/sha}",
+  "trees_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/git/trees{/sha}",
+  "statuses_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/statuses/{sha}",
+  "languages_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/languages",
+  "stargazers_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/stargazers",
+  "contributors_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/contributors",
+  "subscribers_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/subscribers",
+  "subscription_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/subscription",
+  "commits_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/commits{/sha}",
+  "git_commits_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/git/commits{/sha}",
+  "comments_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/comments{/number}",
+  "issue_comment_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/issues/comments{/number}",
+  "contents_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/contents/{+path}",
+  "compare_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/compare/{base}...{head}",
+  "merges_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/merges",
+  "archive_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/{archive_format}{/ref}",
+  "downloads_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/downloads",
+  "issues_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/issues{/number}",
+  "pulls_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/pulls{/number}",
+  "milestones_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/milestones{/number}",
+  "notifications_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/notifications{?since,all,participating}",
+  "labels_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/labels{/name}",
+  "releases_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/releases{/id}",
+  "deployments_url": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/deployments",
+  "created_at": "2020-09-03T17:47:33Z",
+  "updated_at": "2020-09-03T17:51:34Z",
+  "pushed_at": "2020-09-03T19:05:31Z",
+  "git_url": "git://github.com/hub4j-test-org/updateOutdatedBranches.git",
+  "ssh_url": "git@github.com:hub4j-test-org/updateOutdatedBranches.git",
+  "clone_url": "https://github.com/hub4j-test-org/updateOutdatedBranches.git",
+  "svn_url": "https://github.com/hub4j-test-org/updateOutdatedBranches",
+  "homepage": null,
+  "size": 1,
+  "stargazers_count": 0,
+  "watchers_count": 0,
+  "language": null,
+  "has_issues": true,
+  "has_projects": true,
+  "has_downloads": true,
+  "has_wiki": true,
+  "has_pages": false,
+  "forks_count": 0,
+  "mirror_url": null,
+  "archived": false,
+  "disabled": false,
+  "open_issues_count": 0,
+  "license": null,
+  "forks": 0,
+  "open_issues": 0,
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/__files/repos_hub4j-test-org_updateoutdatedbranches_pulls_9-6.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/__files/repos_hub4j-test-org_updateoutdatedbranches_pulls_9-6.json
new file mode 100644
index 0000000000..93adeed9f5
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/__files/repos_hub4j-test-org_updateoutdatedbranches_pulls_9-9.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/__files/repos_hub4j-test-org_updateoutdatedbranches_pulls_9-9.json
new file mode 100644
index 0000000000..4fb3d0c06d
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/orgs_hub4j-test-org-1.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/orgs_hub4j-test-org-1.json
new file mode 100644
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+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/orgs_hub4j-test-org-1.json
@@ -0,0 +1,46 @@
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches-2.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches-2.json
new file mode 100644
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@@ -0,0 +1,46 @@
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches_git_refs_heads_outdated-3.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches_git_refs_heads_outdated-3.json
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@@ -0,0 +1,47 @@
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches_git_refs_heads_outdated-4.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches_git_refs_heads_outdated-4.json
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@@ -0,0 +1,52 @@
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diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches_git_refs_heads_outdated-7.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches_git_refs_heads_outdated-7.json
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@@ -0,0 +1,52 @@
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@@ -0,0 +1,53 @@
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+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:36 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
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+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding, Accept, X-Requested-With",
+        "Accept-Encoding"
+      ],
+      "ETag": "\"36242180e9b56e9bb401bc17370064d6\"",
+      "Location": "https://api.github.com/repos/hub4j-test-org/updateOutdatedBranches/pulls/9",
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+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_9-6.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_9-6.json
new file mode 100644
index 0000000000..1702cdd13d
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_9-6.json
@@ -0,0 +1,46 @@
+{
+  "id": "ce75c972-790c-4198-a388-087205d78e43",
+  "name": "repos_hub4j-test-org_updateoutdatedbranches_pulls_9",
+  "request": {
+    "url": "/repos/hub4j-test-org/updateOutdatedBranches/pulls/9",
+    "method": "GET",
+    "headers": {
+      "Accept": {
+        "equalTo": "application/vnd.github.shadow-cat-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "repos_hub4j-test-org_updateoutdatedbranches_pulls_9-6.json",
+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:42 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "200 OK",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding, Accept, X-Requested-With",
+        "Accept-Encoding"
+      ],
+      "ETag": "W/\"7e6ec7a092cd314ea7476c98c5ae5bdc\"",
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+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
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+    }
+  },
+  "uuid": "ce75c972-790c-4198-a388-087205d78e43",
+  "persistent": true,
+  "insertionIndex": 6
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_9-9.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_9-9.json
new file mode 100644
index 0000000000..f6bc92de2f
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_9-9.json
@@ -0,0 +1,52 @@
+{
+  "id": "35d9a23c-f552-47fa-b5a6-3521de469b02",
+  "name": "repos_hub4j-test-org_updateoutdatedbranches_pulls_9",
+  "request": {
+    "url": "/repos/hub4j-test-org/updateOutdatedBranches/pulls/9",
+    "method": "PATCH",
+    "headers": {
+      "Accept": {
+        "equalTo": "text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2"
+      }
+    },
+    "bodyPatterns": [
+      {
+        "equalToJson": "{\"state\":\"closed\"}",
+        "ignoreArrayOrder": true,
+        "ignoreExtraElements": false
+      }
+    ]
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "repos_hub4j-test-org_updateoutdatedbranches_pulls_9-9.json",
+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:44 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "200 OK",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding, Accept, X-Requested-With",
+        "Accept-Encoding"
+      ],
+      "ETag": "W/\"0feed482794a521ea1bdb79dfa87ff12\"",
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+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "C86E:BABF:1139964:14CE0AF:5F513E87"
+    }
+  },
+  "uuid": "35d9a23c-f552-47fa-b5a6-3521de469b02",
+  "persistent": true,
+  "insertionIndex": 9
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_9_update-branch-8.json b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_9_update-branch-8.json
new file mode 100644
index 0000000000..9d1a26cfb2
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHPullRequestTest/wiremock/updateOutdatedBranchesUnexpectedHead/mappings/repos_hub4j-test-org_updateoutdatedbranches_pulls_9_update-branch-8.json
@@ -0,0 +1,46 @@
+{
+  "id": "1d311b29-700c-4687-892b-f610e8bcbaa4",
+  "name": "repos_hub4j-test-org_updateoutdatedbranches_pulls_9_update-branch",
+  "request": {
+    "url": "/repos/hub4j-test-org/updateOutdatedBranches/pulls/9/update-branch",
+    "method": "PUT",
+    "headers": {
+      "Accept": {
+        "equalTo": "application/vnd.github.lydian-preview+json"
+      }
+    },
+    "bodyPatterns": [
+      {
+        "equalToJson": "{\"expected_head_sha\":\"6440189369f9f33b2366556a94dbc26f2cfdd969\"}",
+        "ignoreArrayOrder": true,
+        "ignoreExtraElements": false
+      }
+    ]
+  },
+  "response": {
+    "status": 422,
+    "body": "{\"message\":\"expected head sha didn’t match current head ref.\",\"documentation_url\":\"https://docs.github.com/rest/reference/pulls#update-a-pull-request-branch\"}",
+    "headers": {
+      "Date": "Thu, 03 Sep 2020 19:05:43 GMT",
+      "Content-Type": "application/json; charset=utf-8",
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+      "Status": "422 Unprocessable Entity",
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+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Vary": "Accept-Encoding, Accept, X-Requested-With",
+      "X-GitHub-Request-Id": "C86E:BABF:113995C:14CE0A8:5F513E86"
+    }
+  },
+  "uuid": "1d311b29-700c-4687-892b-f610e8bcbaa4",
+  "persistent": true,
+  "insertionIndex": 8
+}
\ No newline at end of file