diff --git a/Gemfile b/Gemfile
index 7a34208..8b6a597 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,4 +2,4 @@ source 'https://rubygems.org'
 gemspec
 
 gem 'rake', '~> 13.0'
-gem 'rubocop', '1.90.0'
+gem 'rubocop', '1.91.0'