diff --git a/.travis.yml b/.travis.yml
index 5c34f84..badc95c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,8 @@ language: node_js
 before_install:
   - "npm install npm -g"
 node_js:
+  - "4.0.0"
+  - "io.js"
   - "0.12"
   - "0.10"
 env: