diff --git a/Gemfile b/Gemfile
index e668adae..9c619662 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,6 @@ source 'https://rubygems.org/'
 
 gemspec
 
-gem 'test-unit', '~> 3.5'
 gem 'minitest', '~> 5.15'
 gem 'rake', '~> 13.0'
 gem 'kramdown', '~> 2.4'