diff --git a/.travis.yml b/.travis.yml
index c9752c8..87063df 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,8 @@ node_js:
 - '0.10'
 - '0.11'
 - '0.12'
+- '4.0'
+- '5.0'
 - iojs
 sudo: false
 after_script: npm install codecov.io && cat ./coverage/lcov.info | codecov