diff --git a/Gemfile b/Gemfile
index 1c2c4b0d..ed1e5df6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,3 +4,11 @@ source 'https://rubygems.org'
 gemspec
 
 gem "minitest"
+
+version = ENV["RAILS_VERSION"] || "4.0"
+
+if version == "master"
+  gem "rails", github: "rails/rails"
+else
+  gem "rails", "~> #{version}"
+end
diff --git a/active_model_serializers.gemspec b/active_model_serializers.gemspec
index 65d6f44c..a3606fd4 100644
--- a/active_model_serializers.gemspec
+++ b/active_model_serializers.gemspec
@@ -18,6 +18,9 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
+  spec.add_dependency "activesupport", ">= 3.2"
+  spec.add_dependency "rails", ">= 3.2"
+
   spec.add_development_dependency "bundler", "~> 1.6"
   spec.add_development_dependency "rake"
 end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index e69de29b..0834af7e 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -0,0 +1,7 @@
+require "bundler/setup"
+
+require "active_model_serializers"
+require "active_support/json"
+
+require 'rails'
+