diff --git a/package.json b/package.json
index 4ccb14e..4e52bb6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@technote-space/github-action-pr-helper",
-  "version": "2.1.0",
+  "version": "2.1.1",
   "description": "PullRequest Helper for GitHub Actions.",
   "keywords": [
     "github",
diff --git a/src/utils/command.ts b/src/utils/command.ts
index 86505db..c5cdaab 100644
--- a/src/utils/command.ts
+++ b/src/utils/command.ts
@@ -7,6 +7,7 @@ import {PullsListResponseData} from '@octokit/types';
 import {
   getActionDetail,
   isDisabledDeletePackage,
+  getPrBaseRef,
   getPrHeadRef,
   getContextBranch,
   getGitFilterStatus,
@@ -30,7 +31,7 @@ const {getWorkspace, useNpm, getOctokit} = Utils;
 const {getLocalRefspec, getRefspec}      = Utils;
 const {getRepository, isPush}            = ContextHelper;
 
-export const getApiHelper = (octokit: Octokit, context: ActionContext, logger?: Logger): ApiHelper => new ApiHelper(octokit, context.actionContext, logger);
+export const getApiHelper = (octokit: Octokit, context: ActionContext, logger?: Logger, refForUpdate?: string): ApiHelper => new ApiHelper(octokit, context.actionContext, logger, {refForUpdate});
 
 export const clone = async(helper: GitHelper, logger: Logger, octokit: Octokit, context: ActionContext): Promise<void> => {
   const branchName = await getPrBranchName(helper, octokit, context);
@@ -367,7 +368,7 @@ export const resolveConflicts = async(branchName: string, helper: GitHelper, log
     }
     await commit(helper, logger, context);
     await forcePush(branchName, helper, logger, context);
-    await getApiHelper(getOctokit(getApiToken()), context, logger).pullsCreateOrUpdate(branchName, {
+    await getApiHelper(getOctokit(getApiToken()), context, logger, getPrBaseRef(context)).pullsCreateOrUpdate(branchName, {
       title: await getPrTitle(helper, octokit, context),
       body: await getPrBody(false, files, output, helper, octokit, context),
     });