diff --git a/.travis.yml b/.travis.yml
index 0576f94..8e5dcce 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,7 @@
 language: ruby
 rvm:
-  - 2.1.4
+  - 2.2
+  - rbx-2
+  - ruby-head
+  - 2.1
+  - 2.0