diff --git a/docker.json b/docker.json
index d69fb91..3d68632 100644
--- a/docker.json
+++ b/docker.json
@@ -52,7 +52,7 @@
       ],
       "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>.*)\"?"
+        "# renovate: datasource=(?<datasource>\\S+) depName=(?<depName>\\S+)( versioning=(?<versioning>.*?))?\\nENV .*?_VERSION=\"?(?<currentValue>[^${}\"\\s]+)\"?"
       ]
     }
   ]