diff --git a/package.json b/package.json
index 735233f..d9c7de2 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "body-parser": "^1.18.2",
     "create-cert": "^1.0.2",
     "express": "^4.15.3",
-    "pify": "^3.0.0"
+    "pify": "^4.0.0"
   },
   "devDependencies": {
     "ava": "^0.25.0",