diff --git a/.github/maintainers_guide.md b/.github/maintainers_guide.md
index 7c6f2550..49ed9b7a 100644
--- a/.github/maintainers_guide.md
+++ b/.github/maintainers_guide.md
@@ -21,7 +21,7 @@ coffeescript syntax. This ensures that backwards compatibility is tested and the
 ### Generating Documentation
 
 The source files are contained in the `docs` directory.  The documentation is built using [Jekyll](https://jekyllrb.com/) and hosted with GitHub Pages. The documentation is built automatically with each
-merge to `master` on GitHub.
+merge to `main` on GitHub.
 
 ### Releasing
 
@@ -31,11 +31,11 @@ merge to `master` on GitHub.
     *  Commit with a message including the new version number. For example `v1.0.8`.
     *  Tag the commit with the version number. For example `v1.0.8`.
 
-2.  Merge into master repository
+2.  Merge into main repository
     *  Create a pull request with the commit that was just made. Be certain to include the tag. For
-       example: `git push username master:rel-v1.0.8 && git push --tags username`.
+       example: `git push username main:rel-v1.0.8 && git push --tags username`.
     *  Once tests pass and a reviewer has approved, merge the pull request. You will also want to
-       update your local `master` branch.
+       update your local `main` branch.
 
 3.  Distribute the release
     *  Publish to the package manager. Once you have permission to publish on npm, you can run `npm publish`.
@@ -58,7 +58,7 @@ using git.
 
 ### Branches
 
-`master` is where active development occurs. Long running named feature branches are occasionally
+`main` is where active development occurs. Long running named feature branches are occasionally
 created for collaboration on a feature that has a large scope (because everyone cannot push commits
 to another person's open Pull Request). At some point in the future after a major version increment,
 there may be maintenance branches for older major versions.
diff --git a/docs/_posts/2021-01-26-v4.9.0.md b/docs/_posts/2021-01-26-v4.9.0.md
new file mode 100644
index 00000000..07be3acb
--- /dev/null
+++ b/docs/_posts/2021-01-26-v4.9.0.md
@@ -0,0 +1,8 @@
+---
+layout: changelog
+---
+
+* #557 #612 Enable to increase page size for Web API calls - thanks @kintarowins @iancward
+* #615 #617 res.message.user is invalid when a message posted using a user token - thanks @buzztaiki
+
+Here is the list of all the issues/pull requests in this release: https://github.com/slackapi/hubot-slack/issues?q=milestone%3A4.9.0
\ No newline at end of file
diff --git a/package.json b/package.json
index 0f287bb2..d9452142 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "hubot-slack",
-  "version": "4.8.1",
+  "version": "4.9.0",
   "description": "A Slack adapter for hubot",
   "main": "./slack",
   "scripts": {