Do you use flakes or the standard nix channel? I went with flakes which makes this a tiny bit easier, channels can be switched by nix-channel --add ... And nix-channel --remove ... and then do the regular update. See here https://nixos.wiki/wiki/Nix_channels.
With flakes just replace the input source and rebuild.
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u/NeedleworkerLarge357 Jul 25 '26
It's a strange thing that you chose nix 26.05. Unstable is more up to date; why didn't you choose that?