diff --git a/cancancan.gemspec b/cancancan.gemspec
index e24fdcc1..a7034fa1 100644
--- a/cancancan.gemspec
+++ b/cancancan.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
   s.files       = `git ls-files lib init.rb cancancan.gemspec`.split($INPUT_RECORD_SEPARATOR)
   s.require_paths = ['lib']
 
-  s.required_ruby_version = '>= 2.0.0'
+  s.required_ruby_version = '>= 2.2.0'
 
   s.add_development_dependency 'bundler', '~> 1.3'
   s.add_development_dependency 'rubocop', '~> 0.48.1'