diff --git a/.travis.yml b/.travis.yml
index f8bd068..eb828c1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,3 +17,4 @@ matrix:
       - rvm: rbx-18mode
       - rvm: 1.8.7
       - rvm: 1.9.2
+      - rvm: ruby-head