diff --git a/colorls.gemspec b/colorls.gemspec
index e9564e07..52107832 100644
--- a/colorls.gemspec
+++ b/colorls.gemspec
@@ -80,6 +80,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop-rake', '~> 0.5'
   spec.add_development_dependency 'rubocop-rspec', '~> 2.18.1'
   spec.add_development_dependency 'rubygems-tasks', '~> 0'
-  spec.add_development_dependency 'simplecov', '~> 0.21.2'
+  spec.add_development_dependency 'simplecov', '~> 0.22.0'
   spec.metadata['rubygems_mfa_required'] = 'true'
 end