diff --git a/package.json b/package.json
index d9b752f..3cc3ca6 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,6 @@
   "devDependencies": {
     "expect.js": "^0.3.1",
     "lodash.difference": "^4.2.0",
-    "mocha": "^3.0.2"
+    "mocha": "^4.0.1"
   }
 }