{
  description = "matrix-synapse 1.129.0";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/907e98d6cc08e3261b63e3f8d2831841817b0041";

  outputs =
    { nixpkgs, ... }:
    let
      forAllSystems = nixpkgs.lib.genAttrs [
        "x86_64-linux"
        "aarch64-linux"
      ];
    in
    {
      packages = forAllSystems (system: {
        default = nixpkgs.legacyPackages.${system}.matrix-synapse;
        matrix-synapse = nixpkgs.legacyPackages.${system}.matrix-synapse;
        matrix-synapse-unwrapped = nixpkgs.legacyPackages.${system}.matrix-synapse-unwrapped;
      });

      overlays.default = _final: prev:
        let
          pinned = nixpkgs.legacyPackages.${prev.stdenv.hostPlatform.system};
        in
        {
          matrix-synapse = pinned.matrix-synapse;
          matrix-synapse-unwrapped = pinned.matrix-synapse-unwrapped;
        };
    };
}