{ pkgs, inputs, ... }:
{
  nix = {
    package = pkgs.lixPackageSets.stable.lix;

    gc = {
      automatic = true;
      options = "--delete-older-than 3d";
    };

    settings = {
      experimental-features = [
        "nix-command"
        "flakes"
      ];
    };
  };

  nixpkgs = {
    config = {
      allowUnfree = true;
    };

    overlays = [
      (final: prev: {
        inherit (final.lixPackageSets.stable)
          nixpkgs-review
          nix-direnv
          nix-eval-jobs
          nix-fast-build
          colmena
          ;
      })
    ];
  };

  system.autoUpgrade = {
    enable = true;
    flake = inputs.self.outPath;
    flags = [
      "--update-input"
      "nixpkgs"
      "-L"
    ];
    dates = "02:00";
    randomizedDelaySec = "1h";
  };

}