diff --git a/.travis.yml b/.travis.yml
index 1c54561..7f77855 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 language: node_js
 node_js:
+- '4'
 - '5'
 - '6'
 deploy:
diff --git a/package.json b/package.json
index 7db3c61..f55171a 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
     "url": "https://github.com/cskeppstedt/json-post-process-webpack-plugin.git"
   },
   "engines": {
-    "node": ">=6.9.2"
+    "node": ">=4.3.2"
   },
   "keywords": [],
   "author": "Christoffer Skeppstedt <c.skeppstedt@gmail.com> (https://github.com/cskeppstedt/)",