diff --git a/package.json b/package.json
index 7e8d1ec..783eda3 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
   "devDependencies": {
     "assume": "~1.5.0",
     "istanbul": "~0.4.5",
-    "mocha": "~3.5.0",
+    "mocha": "~4.0.0",
     "pre-commit": "~1.2.0"
   }
 }