diff --git a/Gemfile b/Gemfile
index 1a35a9c..e45ad3f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -25,11 +25,6 @@ gem 'selenium-webdriver'
 
 rails_version = ENV['RAILS_VERSION'] || '∞'
 
-# test-unit-activesupport 1.1.0 introduces a Ruby <= 2.2 incompatibility
-if RUBY_VERSION[/\d+\.\d+/] <= '2.2'
-  gem 'test-unit-activesupport', '1.0.9'
-end
-
 platforms :ruby do
   gem 'sqlite3', rails_version >= '5.1' ? '>= 1.4' : '< 1.4', require: false
   gem 'pg', rails_version >= '5.1' ? '>= 1.0.0' : '< 1.0.0', require: false