diff --git a/colorls.gemspec b/colorls.gemspec
index 64700426..73577cb5 100644
--- a/colorls.gemspec
+++ b/colorls.gemspec
@@ -58,7 +58,7 @@ 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', '~> 0.63.0'
+  spec.add_development_dependency 'rubocop', '~> 0.64.0'
   spec.add_development_dependency 'rubocop-rspec', '~> 1.27'
   spec.add_development_dependency 'rubygems-tasks', '~> 0'
   spec.add_development_dependency 'simplecov', '~> 0.16.1'