diff --git a/.travis.yml b/.travis.yml
index baf9be7..eba81ca 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,3 +3,5 @@ node_js:
   - "0.10"
   - "0.12"
   - "io.js"
+  - "4.0"
+  - "5.0"