diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3272f4e..d6ef0cc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+### [4.0.0] - 2018-02-17
 ### Breaking Changes
 - remove support for EOL ruby `< 2.3` as they are EOL (@majormoses)
 
@@ -167,7 +168,8 @@ The changes in earlier releases are not fully documented but comparison links ar
 * [v0.1.1]
 * [v0.1.0]
 
-[Unreleased]: https://github.com/sensu-plugins/sensu-plugin/compare/3.0.1...HEAD
+[Unreleased]: https://github.com/sensu-plugins/sensu-plugin/compare/4.0.0...HEAD
+[4.0.0]: https://github.com/sensu-plugins/sensu-plugin/compare/3.0.1...4.0.0
 [3.0.1]: https://github.com/sensu-plugins/sensu-plugin/compare/3.0.0...3.0.1
 [3.0.0]: https://github.com/sensu-plugins/sensu-plugin/compare/2.7.0...3.0.0
 [2.7.0]: https://github.com/sensu-plugins/sensu-plugin/compare/2.6.1...2.7.0
diff --git a/lib/sensu-plugin.rb b/lib/sensu-plugin.rb
index e7cfbab..c880bc0 100644
--- a/lib/sensu-plugin.rb
+++ b/lib/sensu-plugin.rb
@@ -2,7 +2,7 @@
 
 module Sensu
   module Plugin
-    VERSION = '3.0.1'
+    VERSION = '4.0.0'
     EXIT_CODES = {
       'OK'       => 0,
       'WARNING'  => 1,
diff --git a/sensu-plugin.gemspec b/sensu-plugin.gemspec
index 9f97ea1..4eb93fb 100644
--- a/sensu-plugin.gemspec
+++ b/sensu-plugin.gemspec
@@ -17,7 +17,7 @@ Gem::Specification.new do |s|
   s.executables           = Dir.glob('bin/**/*.rb').map { |file| File.basename(file) }
   s.files                 = Dir.glob('{bin,lib}/**/*')
   s.test_files            = Dir['test/*.rb']
-  s.required_ruby_version = '~> 2.0'
+  s.required_ruby_version = '>= 2.3'
 
   s.add_dependency 'json',       '< 3.0.0'
   s.add_dependency 'mixlib-cli', '~> 1.5'