{ pkgs }:
self: super: {

  alembic = super.alembic.overridePythonAttrs (
    _: {
      src = pkgs.fetchgit {
        url = "https://github.com/sqlalchemy/alembic.git";
        rev = "8d6bb007a4de046c4d338f4b79b40c9fcbf73ab7";
        sha256 = "15q4dsn4b1cjf1a4cxymxl2gzdjnv9zlndk98jmpfhssqsr4ky3w";
      };
    }
  );

  colorama = super.colorama.overridePythonAttrs (
    _: {
      src = pkgs.fetchgit {
        url = "https://github.com/tartley/colorama.git";
        rev = "4321bbfda9aa190acdad05eb901d3b59439f0ec9";
        sha256 = "1z88yl4r4g6yv29rw0q7zwylgx9zss360n3s9v07macvv50cb452";
      };
    }
  );

  s3transfer = super.s3transfer.overridePythonAttrs (
    _: {
      src = pkgs.fetchgit {
        url = "https://github.com/boto/s3transfer.git";
        rev = "b2b6c44cb283e134f6bf9fecad7ff5ee28df793d";
        sha256 = "1dzjzfxp9rkrh1s6ic22kwmr00hqrgz0da330vydlfpmcqgyp1fy";
      };
    }
  );

}