diff --git a/package.json b/package.json
index 247d7c9..b794945 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
   "devDependencies": {
     "bluebird": "2",
     "istanbul": "0",
-    "mocha": "2",
+    "mocha": "2.4.5",
     "mongodb": "2"
   },
   "scripts": {