diff --git a/package.json b/package.json
index b54f52a..733c244 100644
--- a/package.json
+++ b/package.json
@@ -46,7 +46,7 @@
     "jscs": "^3.0.3",
     "mocha": "^3.0.2",
     "mock-enb": "^0.3.6",
-    "mock-fs": "^3.9.0",
+    "mock-fs": "^4.1.0",
     "must": "^0.13.1",
     "node-eval": "^1.0.2",
     "proxyquire": "^1.7.10",