This is old news but I thought still worth mentioning. Last month Drupal 8 reached its end-of-life. This means that all versions of Drupal 8 core and Drupal contributed project releases that are compatible with only Drupal 8 have been marked unsupported and are no longer supported by the Drupal security team.
Drupal 8.0.0 was first released on November 9, 2015. The last version was released on November 17, 2021. With the end of life approaching, I also updated my two websites from Drupal 8 to Drupal 9.