diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4c716f0..392ac59 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 This CHANGELOG follows the located [here](https://github.com/sensu-plugins/community/blob/master/HOW_WE_CHANGELOG.md)
 
 ## [Unreleased]
+
+## [4.0.0] - 2019-04-18
 ### Breaking Changes
 - Update minimum required ruby version to 2.3. Drop unsupported ruby versions.
 - Bump `sensu-plugin` dependency from `~> 1.2` to `~> 4.0` you can read the changelog entries for [4.0](https://github.com/sensu-plugins/sensu-plugin/blob/master/CHANGELOG.md#400---2018-02-17), [3.0](https://github.com/sensu-plugins/sensu-plugin/blob/master/CHANGELOG.md#300---2018-12-04), and [2.0](https://github.com/sensu-plugins/sensu-plugin/blob/master/CHANGELOG.md#v200---2017-03-29)
@@ -153,7 +155,8 @@ This CHANGELOG follows the located [here](https://github.com/sensu-plugins/commu
 ### Added
 - initial release
 
-[Unreleased]: https://github.com/sensu-plugins/sensu-plugins-memory-checks/compare/3.2.0...HEAD
+[Unreleased]: https://github.com/sensu-plugins/sensu-plugins-memory-checks/compare/4.0.0...HEAD
+[4.0.0]: https://github.com/sensu-plugins/sensu-plugins-memory-checks/compare/3.2.0..4.0.0
 [3.2.0]: https://github.com/sensu-plugins/sensu-plugins-memory-checks/compare/3.1.3..3.2.0
 [3.1.3]: https://github.com/sensu-plugins/sensu-plugins-memory-checks/compare/3.1.2...3.1.3
 [3.1.2]: https://github.com/sensu-plugins/sensu-plugins-memory-checks/compare/3.1.1...3.1.2
diff --git a/lib/sensu-plugins-memory-checks/version.rb b/lib/sensu-plugins-memory-checks/version.rb
index f7f9258..2e383d4 100644
--- a/lib/sensu-plugins-memory-checks/version.rb
+++ b/lib/sensu-plugins-memory-checks/version.rb
@@ -1,7 +1,7 @@
 module SensuPluginsMemoryChecks
   module Version
-    MAJOR = 3
-    MINOR = 2
+    MAJOR = 4
+    MINOR = 0
     PATCH = 0
 
     VER_STRING = [MAJOR, MINOR, PATCH].compact.join('.')