diff --git a/package.json b/package.json
index 5cf3de1..c2705be 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "assume": "~1.5.0",
     "browserify": "~14.4.0",
     "istanbul": "0.4.x",
-    "mocha": "~3.5.0",
+    "mocha": "~4.0.0",
     "pre-commit": "~1.2.0",
     "zuul": "3.11.x"
   }