diff --git a/package.json b/package.json
index 3f7c185..cc57f18 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,6 @@
   "license": "MIT",
   "dependencies": {
     "chai": "^3.5.0",
-    "mocha": "^2.4.5"
+    "mocha": "^4.0.0"
   }
 }