diff --git a/package.json b/package.json
index f496398..160449b 100644
--- a/package.json
+++ b/package.json
@@ -25,5 +25,8 @@
     "chai": "^3.5.0",
     "mocha": "^2.4.5",
     "node-tunnel": "^0.1.2"
+  },
+  "dependencies": {
+    "util-extend": "^1.0.3"
   }
 }