diff --git a/package.json b/package.json
index 2386026..1a918ba 100644
--- a/package.json
+++ b/package.json
@@ -111,7 +111,7 @@
     "karma-firefox-launcher": "^1.0.1",
     "karma-mocha": "^1.3.0",
     "karma-webpack": "^2.0.5",
-    "mocha": "^3.5.3",
+    "mocha": "^4.0.1",
     "mocha-loader": "^1.1.1",
     "node-sass": "^4.6.0",
     "react-hot-loader": "^3.1.1",