{
  inputs = {
    nixpkgsOld.url = "github:NixOS/nixpkgs/nixos-23.11";
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
    nixpkgsUnstable.url = "github:NixOS/nixpkgs/nixos-unstable";
    #nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    arion.url = "github:hercules-ci/arion";
    mms.url = "github:mkaito/nixos-modded-minecraft-servers";
    simple-nixos-mailserver.url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-24.05";
    conduit = {
      url = "gitlab:famedly/conduit";
    };
  };

  outputs = {
    self,
    nixpkgsOld,
    nixpkgs,
    nixpkgsUnstable,
    ...
  } @ inputs: let
    hostPkgs = import nixpkgs {system = "x86_64-linux";};
  in {
    devShell."x86_64-linux" = with hostPkgs;
      mkShell {
        buildInputs = [colmena pass];
      };
    colmena = {
      meta = {
        nixpkgs = import nixpkgs {
          system = "aarch64-linux";
          overlays = [];
        };
        specialArgs = {
          inherit inputs nixpkgsUnstable;
          pkgsUnstable = import nixpkgsUnstable {
            system = "aarch64-linux";
            overlays = [];
          };
          pkgsOld = import nixpkgsOld {
            system = "aarch64-linux";
            overlays = [];
          };
        };
      };

      katzencafe = {
        name,
        nodes,
        pkgs,
        pkgsUnstable,
        inputs,
        ...
      }: {
        deployment = {
          targetHost = "katzen.cafe";
          buildOnTarget = true;
        };
        imports = [
          ./modules/base-stuff.nix
          ./modules/proxy.nix
          ./modules/postgres.nix
          ./modules/jitsi.nix
          ./modules/containers
          ./modules/conduit.nix
          ./modules/keycloak.nix
          ./modules/forgejo.nix
          ./modules/mumble.nix
          ./modules/modded-mc.nix
          ./modules/monitoring.nix
          ./modules/mailserver.nix
          ./modules/vaultwarden.nix
          ./modules/hedgedoc.nix
          ./modules/invidious.nix
        ];

        system.stateVersion = "22.11";
      };
    };
  };
}