diff --git a/package.json b/package.json
index ad439e61..61b8d50b 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
     "jwt",
     "browser"
   ],
+  "engine": { "node": ">=6.9.0" },
   "scripts": {
     "start": "gulp dev",
     "build": "gulp build",