diff --git a/.travis.yml b/.travis.yml
index 1788f3d..15ff245 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,9 @@ before_script:
 rvm:
   - 1.9.3
   - 2.0.0
+  - 2.1.0
+  - 2.2.0
+  - 2.3.0
   - jruby-head
   - rbx
   - ruby-head