Linux (Debina 10) not updating?

Just installed Tailscale on Debian 10 Buster and I got version 1.10.1 which is not current (expecting 1.12.3). Doing apt-get update / upgrade does not trigger a more recent version. Is this expected ? Am I missing something (quite possible, my first *nix deployment)

I’m not sure why that would happen. I’d suggest adding the repository again: