diff --git a/CHANGELOG.md b/CHANGELOG.md
index 87ce3b4..787f547 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,12 +4,15 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [Unreleased](https://github.com/stefanzweifel/git-auto-commit-action/compare/v4.1.6...HEAD)
+## [Unreleased](https://github.com/stefanzweifel/git-auto-commit-action/compare/v4.2.0...HEAD)
 
 > TBD
 
+
+## [v4.2.0](https://github.com/stefanzweifel/git-auto-commit-action/compare/v4.1.6...v4.2.0) - 2020-05-10
+
 ### Changed
-- Use `${{ github.head_ref }}` as default branch value. [#75](https://github.com/stefanzweifel/git-auto-commit-action/pull/75), [#73](https://github.com/stefanzweifel/git-auto-commit-action/pull/73)
+- Use `${{ github.head_ref }}` as default branch value. Therefore, the branch name when listening for `pull_request`-events is optional. [#75](https://github.com/stefanzweifel/git-auto-commit-action/pull/75), [#73](https://github.com/stefanzweifel/git-auto-commit-action/pull/73)
 
 
 ## [v4.1.6](https://github.com/stefanzweifel/git-auto-commit-action/compare/v4.1.5...v4.1.6) - 2020-04-28
diff --git a/README.md b/README.md
index 1f917df..0efdded 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ This Action has been inspired and adapted from the [auto-commit](https://github.
 Add the following step at the end of your job, after other steps that might add or change files.
 
 ```yaml
-- uses: stefanzweifel/git-auto-commit-action@v4.1.6
+- uses: stefanzweifel/git-auto-commit-action@v4.2.0
   with:
     # Required
     commit_message: Apply automatic changes
@@ -68,7 +68,7 @@ jobs:
     - name: Run php-cs-fixer
       uses: docker://oskarstark/php-cs-fixer-ga
 
-    - uses: stefanzweifel/git-auto-commit-action@v4.1.6
+    - uses: stefanzweifel/git-auto-commit-action@v4.2.0
       with:
         commit_message: Apply php-cs-fixer changes
 ```