Bookworm and updates question

[Bob McGowan]

I have two systems running bookworm, a laptop at 12.13 and a desktop at 12.11. I am still able to update the laptop from bookworm repositories but the desktop refuses, telling me that repositories have changed "Version" and 'Codename' to various trixie related values. I would like to stay on bookworm for a while and also to keep the two systems at the same level. How would I "fix" this so the desktop will update from bookworm? Thanks, Bob