diff --git a/package.json b/package.json
index b94f4f1..45210c9 100644
--- a/package.json
+++ b/package.json
@@ -34,6 +34,6 @@
   "devDependencies": {
     "eslint": "^4.1.0",
     "chai": "^4.0.1",
-    "mocha": "^3.2.0"
+    "mocha": "^4.0.0"
   }
 }