diff --git a/package.json b/package.json
index c3bfa2cd..2386551a 100644
--- a/package.json
+++ b/package.json
@@ -97,7 +97,7 @@
     "es6-promisify": "^6.0.2",
     "execon": "^1.2.0",
     "express": "^4.13.0",
-    "files-io": "^3.0.0",
+    "files-io": "^4.0.0",
     "find-up": "^5.0.0",
     "for-each-key": "^2.0.0",
     "format-io": "^2.0.0",