diff --git a/package.json b/package.json
index 29603a6..86c4332 100644
--- a/package.json
+++ b/package.json
@@ -89,7 +89,7 @@
     "karma-mocha": "^1.1.1",
     "karma-phantomjs-launcher": "^1.0.0",
     "karma-sauce-launcher": "^1.1.0",
-    "mocha": "^3.0.0",
+    "mocha": "^4.0.0",
     "nodent": "^3.0.17",
     "nyc": "^11.0.2",
     "phantomjs-prebuilt": "^2.1.4",