diff --git a/renovate.json b/renovate.json
index dbe9f626a..25cf55014 100644
--- a/renovate.json
+++ b/renovate.json
@@ -2,6 +2,6 @@
   "extends": [
     "config:base"
   ],
-  "schedule": "on the last day of the month",
+  "schedule": ["on the last day of the month"],
   "excludePackageNames": ["lunr", "react-syntax-highlighter"]
 }