diff --git a/package.json b/package.json
index 297e6c8..96a231a 100644
--- a/package.json
+++ b/package.json
@@ -34,7 +34,7 @@
     "eval": "^0.1.1",
     "frontmatter-loader": "0.0.1",
     "json-loader": "^0.5.4",
-    "memory-fs": "^0.4.1",
+    "memory-fs": "^0.5.0",
     "nyc": "^10.0.0",
     "webpack": "^2.2.0-rc.1"
   },