Sparky oldoldstable 4 “Tyche” reached its end-of-life on July 1, 2022, as well as Debian 9 “Stretch” LTS. Sparky 4 is based on Debian 9 so support for Sparky 4 has been finished.
If you still use Sparky 4, I recommend to upgrade to Sparky 5 “Nibiru”, following the Wiki page:
https://wiki.sparkylinux.org/doku.php/upgrade_4_to_5
Alternatively, backup your personal data and make fresh installation of Sparky 5 oldstable or Sparky 6 stable.
The next LTS release is Sparky 5 “Nibiru” based on Debian 10 “Buster” LTS, which will be supported to June 2024.