diff --git a/renovate.json5 b/renovate.json5
index 5a55195..471084e 100644
--- a/renovate.json5
+++ b/renovate.json5
@@ -7,11 +7,15 @@
   dockerfile: {
     fileMatch: ["examples/.+/Dockerfile$"]
   },
-  customManagers: {
-    dockerfileVersions: {
+  customManagers: [
+    {
+      customType: "regex",
       fileMatch: ["examples/.+/Dockerfile$"]
+      matchStrings: [
+        "# renovate: datasource=(?<datasource>[a-z-.]+?) depName=(?<depName>[^\\s]+?)(?: (lookupName|packageName)=(?<packageName>[^\\s]+?))?(?: versioning=(?<versioning>[^\\s]+?))?(?: extractVersion=(?<extractVersion>[^\\s]+?))?(?: registryUrl=(?<registryUrl>[^\\s]+?))?\\s(?:ENV|ARG)\\s+[A-Za-z0-9_]+?_VERSION[ =][\"']?(?<currentValue>.+?)[\"']?\\s"
+      ]
     }
-  },
+  ],
   packageRules: [
     {
       matchUpdateTypes: [