diff --git a/package.json b/package.json
index fd0b219d..4a12641f 100644
--- a/package.json
+++ b/package.json
@@ -28,5 +28,8 @@
   "devDependencies": {
     "mocha": "^3.4.2",
     "proxy": "^0.2.4"
+  },
+  "engines": {
+    "node": ">= 4.5.0"
   }
 }