- systemd may warn your system about the permissions of your ESP partition
      (often `/boot`), this warning can be ignored for now, we are looking into
      a satisfying solution regarding this problem.
    - Updating with `nixos-rebuild boot` and rebooting is recommended, since in
      some rare cases the `nixos-rebuild switch` into the new generation on a
      live system might fail due to missing mount units.

- If the user has a custom shell enabled via `users.users.${USERNAME}.shell =
  ${CUSTOMSHELL}`, the assertion will require them to also set
  `programs.${CUSTOMSHELL}.enable = true`. This is generally safe behavior, but
  for anyone needing to opt out from the check
  `users.users.${USERNAME}.ignoreShellProgramCheck = true` will do the job.

- `yarn-berry` has been updated to v4.0.1. This means that NodeJS versions less
  v18.12 are no longer supported by it. Refer to the [upstream
  changelog](https://github.com/yarnpkg/berry/blob/master/CHANGELOG.md) for
  more details.

- GNOME has been updated to v45. Refer to the [release
  notes](https://release.gnome.org/45/) for more details. Notably, Loupe has
  replaced Eye of GNOME as the default image viewer, Snapshot has replaced
  Cheese as the default camera application, and Photos will no longer be
  installed.

- The module `services.ankisyncd` has been switched to
  [anki-sync-server-rs](https://github.com/ankicommunity/anki-sync-server-rs).
  The former version written in Python was difficult to update, did not receive
  updates in a while, and did not support recent versions of Anki.

  Unfortunately all servers supporting new clients do not support the older
  sync protocol that was used in the old server. This includes newer version of
  anki-sync-server, Anki's built in sync server and this new Rust package. Thus
  old clients will also need updating. In particular nixpkgs's Anki package is
  also being updated in this release.

  The module update takes care of the new config syntax. The data itself (i.e.
  user login and card information) is compatible. Thus users of the module will
  be able to simply log in again after updating both client and server without
  any extra action needed to be taken.

- The argument `vendorSha256` of `buildGoModule` is deprecated. Use
  `vendorHash` instead. Refer to [PR
  \#259999](https://github.com/NixOS/nixpkgs/pull/259999)) for more details.

- `go-modules` in `buildGoModule` attrs has been renamed to `goModules`.

- The package `cawbird` is dropped from nixpkgs. It broke by the Twitter API
  closing down and has been abandoned upstream.

- The Cinnamon module now enables XDG desktop integration by default. If you
  are experiencing collisions related to xdg-desktop-portal-gtk you can safely
  remove `xdg.portal.extraPortals = [ pkgs.xdg-desktop-portal-gtk ];` from your
  NixOS configuration.

- GNOME, Pantheon, Cinnamon modules no longer force Qt applications to use
  Adwaita style. This implemantion  was buggy and is no longer maintained
  upstream. Specifically, Cinnamon defaults to the gtk2 style instead now,
  following the default in Linux Mint). If you still want Adwaita used, you may
  add the following options to your configuration. Please be aware, that it
  will probably be removed eventually.

  ```nix
  {
    qt = {
      enable = true;
      platformTheme = "gnome";
      style = "adwaita";
    };
  }
  ```

- DocBook option documentation is no longer supported, all module documentation
  now uses Markdown.

- Docker defaults to v24 now, as 20.10 is stopping to receive security updates
  and bug fixes after [December 10,
  2023](https://github.com/moby/moby/discussions/45104).

- Elixir defaults to v1.15 now. Refer to their
  [changelog](https://elixir-lang.org/blog/2023/06/19/elixir-v1-15-0-released/)
  for more details.

- The `extend` function of `llvmPackages` has been removed due it coming from
  the `tools` attrset thus only extending the `tool` attrset. A possible
  replacement is to construct the set from `libraries` and `tools`, or patch