#!/bin/bash

curl -Ss 'https://github.com/systemd/systemd-stable/tags' \
| tr '<>"' '\n' \
| sed '
  s,^/systemd/systemd-stable/archive/refs/tags/v\([0-9.]\+\)\.tar\.gz$,\1,
  t
  d
' \
| sort -V \
| tail -n1