diff --git a/renovate.json b/renovate.json
index 01650105..7efba19b 100644
--- a/renovate.json
+++ b/renovate.json
@@ -5,7 +5,7 @@
     {
       "customType": "regex",
       "description": "Extract bun version from .prototools",
-      "fileMatch": ["^\\.prototools$"],
+      "managerFilePatterns": ["/^\\.prototools$/"],
       "matchStrings": ["bun\\s*=\\s*\"(?<currentValue>[^\"]+)\""],
       "depNameTemplate": "oven-sh/bun",
       "datasourceTemplate": "github-releases",