diff --git a/package.json b/package.json
index ae2aaae..216778f 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,7 @@
     "karma-coverage": "^1.1.1",
     "karma-mocha": "^1.3.0",
     "karma-webpack": "^2.0.4",
-    "mocha": "^3.5.0",
+    "mocha": "^4.0.0",
     "standard": "^10.0.3",
     "webpack": "^3.5.5"
   },