diff --git a/package.json b/package.json
index ac8a03e2..c651ab82 100644
--- a/package.json
+++ b/package.json
@@ -69,7 +69,7 @@
     "jsdom": "11.3.0",
     "jsdom-global": "3.0.2",
     "minimist": "1.2.0",
-    "mocha": "3.5.3",
+    "mocha": "4.0.0",
     "nyc": "11.2.1",
     "onchange": "3.2.1",
     "rollup": "0.50.0",