diff --git a/Gemfile b/Gemfile
index f8f6661..5907795 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,6 +7,6 @@ gemspec
 
 gem 'minitest', '~> 5.0'
 gem 'rake', '~> 13.0'
-gem 'rubocop', '~> 0.90.0'
+gem 'rubocop', '~> 0.91.0'
 gem 'simplecov', '~> 0.19.0', require: false # CodeClimate not compatible with 0.18+ yet - https://github.com/codeclimate/test-reporter/issues/413
 gem 'simplecov-lcov', '< 0.8'