diff --git a/Gemfile b/Gemfile
index 7cd7aec4..1e72195d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source "https://rubygems.org"
 gemspec
 
 group :development do
-  gem "minitest", "5.21.2"
+  gem "minitest", "5.22.2"
 
   gem "rake-compiler", "1.2.7"
   gem "rake-compiler-dock", "1.4.0"