diff --git a/package.json b/package.json
index 5afb40f..6247405 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
     "chai": "^4.0.0",
     "eslint": "^4.1.0",
     "memory-fs": "^0.4.1",
-    "mocha": "^3.2.0",
+    "mocha": "^4.0.0",
     "nyc": "^11.0.2",
     "webpack": "^3.1.0"
   },