diff --git a/README.md b/README.md
index 1d551fc..3612f28 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ AnyProxy
 
 [npm-image]: https://img.shields.io/npm/v/anyproxy.svg?style=flat-square
 [npm-url]: https://npmjs.org/package/anyproxy
-[node-image]: https://img.shields.io/badge/node.js-%3E=_5.0.0-green.svg?style=flat-square
+[node-image]: https://img.shields.io/badge/node.js-%3E=_6.0.0-green.svg?style=flat-square
 [node-url]: http://nodejs.org/download/
 [download-image]: https://img.shields.io/npm/dm/anyproxy.svg?style=flat-square
 [download-url]: https://npmjs.org/package/anyproxy
diff --git a/package.json b/package.json
index 676290b..b98f47b 100644
--- a/package.json
+++ b/package.json
@@ -108,5 +108,8 @@
     "url": "https://github.com/alibaba/anyproxy"
   },
   "author": "ottomao@gmail.com",
-  "license": "Apache-2.0"
+  "license": "Apache-2.0",
+  "engines": {
+    "node": ">=6.0.0"
+  }
 }