diff --git a/docker.json b/docker.json
index 689b706..6d81426 100644
--- a/docker.json
+++ b/docker.json
@@ -22,7 +22,7 @@
   ],
   "regexManagers": [
     {
-      "fileMatch": ["^Dockerfile$"],
+      "fileMatch": ["Dockerfile"],
       "matchStrings": [
         "# renovate: datasource=(?<datasource>\\S+) depName=(?<depName>\\S+)( versioning=(?<versioning>.*?))?\\nENV .*?_VERSION=\"\\${.*:-(?<currentValue>.*)}\"\\s"
       ]