diff --git a/.travis.yml b/.travis.yml
index 222078e..9577abf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,3 +2,5 @@ language: ruby
 rvm:
   - 1.9.3
   - 2.0.0
+  - 2.1
+  - 2.2
diff --git a/Gemfile b/Gemfile
index 0d13b86..3f1a9ea 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,4 +5,5 @@ gemspec
 group :test do
   gem 'therubyracer', platform: :mri
   gem 'therubyrhino', ">=1.73.3", platform: :jruby
+  gem 'minitest', require: false
 end