diff --git a/fedora-common-ostree.yaml b/fedora-common-ostree.yaml
index d620d39..7b9766f 100644
--- a/fedora-common-ostree.yaml
+++ b/fedora-common-ostree.yaml
@@ -1,6 +1,6 @@
 ref: fedora/rawhide/${basearch}/ostree-base
 
-automatic_version_prefix: "40"
+automatic_version_prefix: "40.<date:%Y%m%d>"
 mutate-os-release: "40"
 
 # Default to `bash` in our container, the same as other containers we ship.