self: super:

{
  discord = super.discord.overrideAttrs (old: rec {
    version = "0.0.15";
    src = builtins.fetchurl {
      url =
        "https://dl.discordapp.net/apps/linux/${version}/discord-${version}.tar.gz";
      sha256 = "0pn2qczim79hqk2limgh88fsn93sa8wvana74mpdk5n6x5afkvdd";
    };
  });
}