Unstable Cosmic DE in stable Nixos

[hustlerone]

There’s around 3 ways to do it.

Take a look at (without flakes). I used to just have a channel and import the channel.

Installing only a single package from `unstable`

Hi there. I manage some NixOS machines, which are pinned to a particular stable branch from 2019, and I’m fine with this. However, the version of certbot that this branch offers is 0.31.0, while unstable has 1.0.0. I’d like to upgrade, and do so via the usual environment.systemPackages list. However, I don’t want to update the whole channel (thus bumping everything else on the system), just certbot. Is this possible? Please and thank you.