diff --git a/package.json b/package.json
index 79d9cb3..420e254 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,7 @@
     "istanbul": "^0.4.1",
     "jshint": "^2.8.0",
     "jshint-stylish": "^2.0.1",
-    "mocha": "^3.0.2",
+    "mocha": "^4.0.0",
     "should": "^13.0.0",
     "vinyl-source-stream": "^1.1.0"
   },