diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2b98438a3..50e552198 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## 6.0.0 - 2022-12-22
+## 6.0.0 - 2023-12-22
 
 ### Backward-incompatible changes
 
@@ -22,6 +22,7 @@ The gem now supports Ruby 3.0+ and Rails 6.1+. ([#1521], [#1522], [#1547], [#154
 
 ### Features
 * Add normalize matcher by @stephannv. ([#1558])
+* Add validates_comparison_of matcher by @matsales28. ([#1552])
 * Add support for Ruby 3.2 by @petergoldstein. ([#1536])
 * Add support for Ruby 3.3.0-rc1 by @mtasaka and @VSPPedro. ([#1579], [#1588])
 * Add support for Rails 7.1 by @matsales28. ([#1573])
@@ -32,6 +33,7 @@ The gem now supports Ruby 3.0+ and Rails 6.1+. ([#1521], [#1522], [#1547], [#154
 
 [#1536]: https://github.com/thoughtbot/shoulda-matchers/pull/1536
 [#1542]: https://github.com/thoughtbot/shoulda-matchers/pull/1542
+[#1542]: https://github.com/thoughtbot/shoulda-matchers/pull/1552
 [#1555]: https://github.com/thoughtbot/shoulda-matchers/pull/1555
 [#1558]: https://github.com/thoughtbot/shoulda-matchers/pull/1558
 [#1560]: https://github.com/thoughtbot/shoulda-matchers/pull/1560
diff --git a/README.md b/README.md
index 22544f40b..81982f3ea 100644
--- a/README.md
+++ b/README.md
@@ -55,7 +55,7 @@ Start by including `shoulda-matchers` in your Gemfile:
 
 ```ruby
 group :test do
-  gem 'shoulda-matchers', '~> 5.0'
+  gem 'shoulda-matchers', '~> 6.0'
 end
 ```
 
@@ -117,7 +117,7 @@ Otherwise, add `shoulda-matchers` to your Gemfile:
 
 ```ruby
 group :test do
-  gem 'shoulda-matchers', '~> 5.0'
+  gem 'shoulda-matchers', '~> 6.0'
 end
 ```