diff --git a/.travis.yml b/.travis.yml
index 465e5d4..514384d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,12 @@
 language: ruby
 rvm:
   - 1.8.7
-  - 1.9.2
   - 1.9.3
   - 2.0.0
-  - 2.1.1
+  - 2.1.10
+  - 2.2.6
+  - 2.3.3
+  - 2.4.0
   - ruby-head
 
 matrix: