diff --git a/renovate.json b/renovate.json
index 80de346..9869889 100644
--- a/renovate.json
+++ b/renovate.json
@@ -16,7 +16,7 @@
         "\\s+ENV\\s*MORTY_VERSION=\"(?<currentDigest>.*?)\"\\s+"
       ],
       "depNameTemplate": "https://github.com/asciimoo/morty.git",
-      "currentValueTemplate": "main",
+      "currentValueTemplate": null,
       "versioningTemplate": "git",
       "datasourceTemplate": "git-refs"
     },