diff --git a/package.json b/package.json
index 07fe3fc..59b9175 100644
--- a/package.json
+++ b/package.json
@@ -9,5 +9,9 @@
   },
   "dependencies": {
     "http-proxy": "~0.8"
+  },
+  "engines": {
+    "node": ">=0.6.6",
+    "npm": ">=1.1.0"
   }
 }