diff --git a/package.json b/package.json
index 6dae7baa..3b545188 100644
--- a/package.json
+++ b/package.json
@@ -56,5 +56,8 @@
     "test-find": "find ./lib/**/__tests__ -name *.test.js | xargs mocha",
     "test": "npm run lint && npm run unit",
     "unit": "node test.js"
+  },
+  "engines": {
+    "node": ">=4.5.0"
   }
 }