How can I upgrade my packages in home-manager?

Ahoy, for various reasons beyond my control, I currently work professionally mainly inside a (SUSE) Linux shell. To make my life easier there, I decided to let home-manager in a user chroot manage my user account’s software. So far, so good. However, most of my work is done inside GNU Emacs. In the nixpkgs I can now find GNU Emacs 31, which would give me a few relevant improvements over GNU Emacs 30. As far as I know, home-manager uses the “latest” version of the Nix packages by default; I hav...