diff --git a/.travis.yml b/.travis.yml
index 74c57bf..7c0bf17 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,5 +4,7 @@ node_js:
   - "0.10"
   - "0.12"
   - "iojs"
+  - "4"
+  - "5"
 before_install:
   - npm install -g npm@~1.4.6