diff --git a/package.json b/package.json
index 68d8c3a..642a5d4 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
   },
   "devDependencies": {
     "istanbul": "0",
-    "mocha": "2",
+    "mocha": "2.4.1",
     "stream-to-array": "2"
   },
   "scripts": {