diff --git a/package.json b/package.json
index 2243418..f393e85 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
   "devDependencies": {
     "coveralls": "^3.0.0",
     "istanbul": "^0.4.5",
-    "mocha": "^3.0.2",
+    "mocha": "^4.0.0",
     "should": "^13.0.0"
   }
 }