{
  lib,
  pkgs,
  config,
  ...
}:
let
  inherit (lib) mkOption;
  inherit (lib.types) str;

  cfg = config.host.version;
in
{
  options.host.version = mkOption {
    type = str;
    default = "25.05";
    description = "System version.";
  };

  config.system.stateVersion = cfg;
}