diff --git a/.travis.yml b/.travis.yml
index cb48b18..98d6208 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,7 +4,7 @@ language: node_js
 
 # see https://docs.travis-ci.com/user/languages/javascript-with-nodejs#Choosing-Node-versions-to-test-against
 node_js:
-  - '4'
+  - '6'
   - 'node'
 
 env: