diff --git a/package.json b/package.json
index 0a7c40c4..722c748d 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,9 @@
   "main": "main.js",
   "author": "Yuya Ochiai",
   "license": "MIT",
+  "engines": {
+    "node": ">=4.2.0"
+  },
   "scripts": {
     "install": "cd src && npm install",
     "postinstall": "npm run build",