diff --git a/Gemfile b/Gemfile
index f425ac0e..e7677c5a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,6 +8,6 @@ gem "rake-compiler"
 gem "test-unit", "~> 3.0"
 
 gem "rack"
-gem 'minitest', '~> 4.0'
+gem 'minitest', '~> 5.8'
 
 gem "jruby-openssl", :platform => "jruby"