diff --git a/Gemfile b/Gemfile
index 9a386356f..659f82e0c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,6 +12,7 @@ version = ENV['RAILS_VERSION'] || '4.2'
 if version == 'master'
   gem 'rack', github: 'rack/rack'
   gem 'arel', github: 'rails/arel'
+  gem 'rails-controller-testing', github: 'rails/rails-controller-testing'
   git 'https://github.com/rails/rails.git' do
     gem 'railties'
     gem 'activesupport'
diff --git a/test/active_model_serializers/test/serializer_test.rb b/test/active_model_serializers/test/serializer_test.rb
index bf4480c76..a0b069433 100644
--- a/test/active_model_serializers/test/serializer_test.rb
+++ b/test/active_model_serializers/test/serializer_test.rb
@@ -1,4 +1,5 @@
 require 'test_helper'
+require 'rails-controller-testing' if Rails::VERSION::MAJOR >= 5
 
 module ActiveModelSerializers
   module Test