diff --git a/.github/workflows/default.yml b/.github/workflows/default.yml
index 0f01481..d3c8010 100644
--- a/.github/workflows/default.yml
+++ b/.github/workflows/default.yml
@@ -25,7 +25,7 @@ jobs:
         with:
           fetch-depth: 0
 
-      - uses: ruby/setup-ruby@v1
+      - uses: ruby/setup-ruby@319994f95fa847cf3fb3cd3dbe89f6dcde9f178f
         with:
           bundler-cache: true
         env:
diff --git a/test/test_helper.rb b/test/test_helper.rb
index f82e632..e53f730 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -2,11 +2,6 @@
 
 require 'minitest/autorun'
 
-# Rails 4.0.x pins to an old minitest
-unless defined?(MiniTest::Test)
-  MiniTest::Test = MiniTest::Unit::TestCase
-end
-
 require 'active_record'
 require 'digest/sha2'
 require 'sequel'