diff --git a/package.json b/package.json
index b56f97c79..4dc11b02f 100644
--- a/package.json
+++ b/package.json
@@ -80,7 +80,7 @@
     "gulp-typescript": "3.2.2",
     "gulp-uglify": "3.0.0",
     "gulp-util": "3.0.8",
-    "mocha": "3.5.3",
+    "mocha": "4.0.1",
     "riot-tag-loader": "1.0.0",
     "string-replace-webpack-plugin": "0.1.3",
     "style-loader": "0.19.0",