diff --git a/.travis.yml b/.travis.yml
index 2d2df49634..df789e4469 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-- '4.0'
+- '6'
 branches:
   except:
   - releases
diff --git a/package.json b/package.json
index e8663d0c19..b44c866b5d 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "url": "git://github.com/Rebilly/ReDoc"
   },
   "engines": {
-    "node": ">=4.0.0",
+    "node": ">=4.7",
     "npm": ">=3.0.0"
   },
   "main": "dist/redoc.min.js",