self: super:
# Overlay that adds future versions of PostgreSQL that are supported by
# PostgREST.
{
  postgresql_14 =
    let
      rev = "76b1e16c6659ccef7187ca69b287525fea133244";
      tarballHash = "1vsahpcx80k2bgslspb0sa6j4bmhdx77sw6la455drqcrqhdqj6a";

      pinnedPkgs =
        builtins.fetchTarball {
          url = "https://github.com/nixos/nixpkgs/archive/${rev}.tar.gz";
          sha256 = tarballHash;
        };
    in
    (import pinnedPkgs { }).pkgs.postgresql_14;
}