diff --git a/colorls.gemspec b/colorls.gemspec
index 4328f1f..509b2a0 100644
--- a/colorls.gemspec
+++ b/colorls.gemspec
@@ -76,7 +76,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'ronn', '~> 0'
   spec.add_development_dependency 'rspec', '~> 3.7'
   spec.add_development_dependency 'rspec-its', '~> 1.2'
-  spec.add_development_dependency 'rubocop', '~> 1.17.0'
+  spec.add_development_dependency 'rubocop', '~> 1.18.0'
   spec.add_development_dependency 'rubocop-performance', '~> 1.11.0'
   spec.add_development_dependency 'rubocop-rake', '~> 0.5'
   spec.add_development_dependency 'rubocop-rspec', '~> 2.0'