diff --git a/.travis.yml b/.travis.yml
index 2b30ed4..0d5c15b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,8 @@ rvm:
   - ree
   - jruby
   - 1.8.6
+  - rbx
+  - rbx-2.0
 
 script: "rake test"