diff --git a/actionview/test/template/url_helper_test.rb b/actionview/test/template/url_helper_test.rb
index 416d30938ae2048178718fb7cb3fabfdd4d6b8e5..027b72b3549b350698c1f3896b162e8aa74446f4 100644
--- a/actionview/test/template/url_helper_test.rb
+++ b/actionview/test/template/url_helper_test.rb
@@ -1,5 +1,4 @@
 require 'abstract_unit'
-require 'minitest/mock'
 
 class UrlHelperTest < ActiveSupport::TestCase
 
diff --git a/activerecord/test/cases/attribute_test.rb b/activerecord/test/cases/attribute_test.rb
index aa419c7a677bea759ae214c9f60fbe6340f5844f..0ec368f51dae8fa44eea806647167bce3facb4b8 100644
--- a/activerecord/test/cases/attribute_test.rb
+++ b/activerecord/test/cases/attribute_test.rb
@@ -1,5 +1,4 @@
 require 'cases/helper'
-require 'minitest/mock'
 
 module ActiveRecord
   class AttributeTest < ActiveRecord::TestCase
diff --git a/activerecord/test/cases/migration/change_table_test.rb b/activerecord/test/cases/migration/change_table_test.rb
index 2ffe7a1b0d3bfea8690919c0a1d7c763ad5cce14..2f9c50141f54fc0e8f3c03870d49a1f06a406a4f 100644
--- a/activerecord/test/cases/migration/change_table_test.rb
+++ b/activerecord/test/cases/migration/change_table_test.rb
@@ -1,5 +1,4 @@
 require "cases/migration/helper"
-require "minitest/mock"
 
 module ActiveRecord
   class Migration
diff --git a/activerecord/test/cases/migration/pending_migrations_test.rb b/activerecord/test/cases/migration/pending_migrations_test.rb
index 7afac83bd21bb7969e63d48c33e5ebb177135db9..4f5589f32a7ae4045111c9c90bf871ddbfd49e4d 100644
--- a/activerecord/test/cases/migration/pending_migrations_test.rb
+++ b/activerecord/test/cases/migration/pending_migrations_test.rb
@@ -1,5 +1,4 @@
 require 'cases/helper'
-require "minitest/mock"
 
 module ActiveRecord
   class Migration