diff --git a/.rubocop.yml b/.rubocop.yml
index 490041e23..60ac9d005 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -4,7 +4,7 @@ require:
 AllCops:
   NewCops: disable
   SuggestExtensions: false
-  TargetRubyVersion: 2.5.1
+  TargetRubyVersion: 2.7.6
   TargetRailsVersion: 5.2.4.6
   Exclude:
     - '**/vendor/**/*'
diff --git a/.ruby-version b/.ruby-version
index 73462a5a1..49cdd668e 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.5.1
+2.7.6
diff --git a/CHANGELOG.md b/CHANGELOG.md
index eaf2a9b5d..d39c51277 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 ## Ckeditor 5.1.2 (unreleased)
 
   * Upgrade CKEditor to 4.22.1 version
+  * Bump ruby version to 2.7.6
 
 ## Ckeditor 5.1.1 (12-1-2021)
 
diff --git a/README.md b/README.md
index 386797689..fc845987e 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ community maintained editor. Currently this gem supports [ckeditor 4](https://ck
 
 ## Features
 
-* CKEditor version 4.x (<https://ckeditor.com/ckeditor-4/>)
+* CKEditor version 4.x (<https://ckeditor.com/cke4/release-notes>)
 * Rails 5.x, 4.2.x integration
 * Files browser
 * HTML5 file uploader