let
  signal-desktop = _: super: {
    signal-desktop = super.signal-desktop.overrideAttrs (old: rec {
      version = "6.34.1";
      src = super.fetchurl {
        url = "https://updates.signal.org/desktop/apt/pool/s/${old.pname}/${old.pname}_${version}_amd64.deb";
        hash = "sha256-1kffRXPQmtxIsLZVOgPXDnxUmY59q+1umy25cditRhw=";
      };
    });
  };
in
signal-desktop