diff --git a/test/array_serializer_test.rb b/test/array_serializer_test.rb
index 1f261772..fd9ffbb5 100644
--- a/test/array_serializer_test.rb
+++ b/test/array_serializer_test.rb
@@ -1,7 +1,7 @@
 require "test_helper"
 require "test_fakes"
 
-class ArraySerializerTest < ActiveModel::TestCase
+class ArraySerializerTest < ActiveSupport::TestCase
 
   def test_array_items_do_not_have_root
     array = [
diff --git a/test/association_test.rb b/test/association_test.rb
index 2cfbd961..c4eb121a 100644
--- a/test/association_test.rb
+++ b/test/association_test.rb
@@ -1,6 +1,6 @@
 require "test_helper"
 
-class AssociationTest < ActiveModel::TestCase
+class AssociationTest < ActiveSupport::TestCase
   def def_serializer(&block)
     Class.new(ActiveModel::Serializer, &block)
   end
diff --git a/test/caching_test.rb b/test/caching_test.rb
index f07f6c31..d66f2e34 100644
--- a/test/caching_test.rb
+++ b/test/caching_test.rb
@@ -1,6 +1,6 @@
 require "test_helper"
 
-class CachingTest < ActiveModel::TestCase
+class CachingTest < ActiveSupport::TestCase
   class NullStore
     def fetch(key)
       return store[key] if store[key]
diff --git a/test/serializer_support_test.rb b/test/serializer_support_test.rb
index 03bd130f..f90fa45f 100644
--- a/test/serializer_support_test.rb
+++ b/test/serializer_support_test.rb
@@ -25,7 +25,7 @@ module Mongoid
   end
 end
 
-class SerializerSupportTest < ActiveModel::TestCase
+class SerializerSupportTest < ActiveSupport::TestCase
   test "it returns nil if no serializer exists" do
     assert_equal nil, RandomModel.new.active_model_serializer
   end
diff --git a/test/serializer_test.rb b/test/serializer_test.rb
index 7e3e5aff..d8695942 100644
--- a/test/serializer_test.rb
+++ b/test/serializer_test.rb
@@ -1,7 +1,7 @@
 require "test_helper"
 require "test_fakes"
 
-class SerializerTest < ActiveModel::TestCase
+class SerializerTest < ActiveSupport::TestCase
   def test_scope_works_correct
     serializer = ActiveModel::Serializer.new :foo, :scope => :bar
     assert_equal serializer.scope, :bar