{
  den.aspects = {
    base = 
      let
        stateVersion = "25.05";
      in 
    {
      nixos = {
        system = {
          inherit stateVersion;
          # See https://github.com/NixOS/nixpkgs/pull/415640
          rebuild.enableNg = true;
        };
      };
      homeManager = {
        home = {
          inherit stateVersion;
        };
      };
    };
  };
}