diff --git a/package.json b/package.json
index eaeb5b7..e0584da 100644
--- a/package.json
+++ b/package.json
@@ -74,7 +74,7 @@
     "karma-phantomjs-launcher": "1.0.4",
     "karma-sinon-chai": "^1.2.4",
     "less": "^2.7.2",
-    "mocha": "^3.2.0",
+    "mocha": "^4.0.0",
     "selenium-webdriver": "3.3.0",
     "sinon": "2.1.0",
     "sinon-chai": "2.9.0",