diff --git a/package.json b/package.json
index e4a0210..628d783 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
   "devDependencies": {
     "istanbul-harmony": "0",
     "koa": "0",
-    "mocha": "2",
+    "mocha": "2.4.1",
     "standardberry": "*",
     "supertest": "^0.15.0"
   },