nixpkgs/pkgs/development/tools/build-managers/rake/gemset.nix

{
  "rake" = {
    version = "11.1.1";
    source = {
      type = "gem";
      sha256 = "0h8wcic2xh3lv7yvs05pqnfqb80jyl488f7136lgxmajb0s1rqhg";
    };
  };
}