diff --git a/package.json b/package.json
index 1ef765b..1828892 100644
--- a/package.json
+++ b/package.json
@@ -62,7 +62,7 @@
     "cz-conventional-changelog": "2.1.0",
     "expect": "^23.0.1",
     "mocha": "^5.0.0",
-    "to-vfile": "^2.0.0",
+    "to-vfile": "^4.0.0",
     "uglify-js": "^3.0.27"
   },
   "config": {