diff --git a/docker.json b/docker.json
index 1ce407d..d69fb91 100644
--- a/docker.json
+++ b/docker.json
@@ -51,7 +51,8 @@
         "(^|/)([Dd]ocker|[Cc]ontainer)file[^/]*$"
       ],
       "matchStrings": [
-        "# renovate: datasource=(?<datasource>\\S+) depName=(?<depName>\\S+)( versioning=(?<versioning>.*?))?\\nENV .*?_VERSION=\"\\${.*:-(?<currentValue>.*)}\"\\s"
+        "# renovate: datasource=(?<datasource>\\S+) depName=(?<depName>\\S+)( versioning=(?<versioning>.*?))?\\nENV .*?_VERSION=\"\\${.*:-(?<currentValue>.*)}\"\\s",
+        "# renovate: datasource=(?<datasource>\\S+) depName=(?<depName>\\S+)( versioning=(?<versioning>.*?))?\\nENV .*?_VERSION=\"?(?<currentValue>.*)\"?"
       ]
     }
   ]