diff --git a/Gemfile b/Gemfile
index 0aa368b..9a2325d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,7 +6,7 @@ source 'https://rubygems.org'
 gemspec
 
 group :development, :test do
-  gem 'minitest', '~> 5.0'
+  gem 'minitest', '~> 6.0'
   gem 'rake', '~> 13.0'
   gem 'rubocop', '~> 1.0', require: false
   gem 'rubocop-minitest', '~> 0.35', require: false