diff --git a/package.json b/package.json
index 2323afd..b349282 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,6 @@
   },
   "devDependencies": {
     "chai": "^3.5.0",
-    "mocha": "^3.2.0"
+    "mocha": "^4.0.0"
   }
 }