diff --git a/renovate.json b/renovate.json
index c66db67..dd1a1d8 100644
--- a/renovate.json
+++ b/renovate.json
@@ -23,7 +23,10 @@
     {
       "customType": "regex",
       "description": "Update _VERSION variables in Dockerfiles",
-      "fileMatch": ["(^|/|\\.)Dockerfile$", "(^|/)Dockerfile\\.[^/]*$"],
+      "managerFilePatterns": [
+        "/(^|/|\\.)Dockerfile$/",
+        "/(^|/)Dockerfile\\.[^/]*$/"
+      ],
       "matchStrings": [
         "# renovate: datasource=(?<datasource>[a-z-]+?)(?: depName=(?<depName>.+?))? packageName=(?<packageName>.+?)(?: versioning=(?<versioning>[a-z-]+?))?\\s(?:ENV|ARG) .+?_VERSION=(?<currentValue>.+?)\\s"
       ]