I prefer ask before to do a mistake. In a Drupal 9.x installation, I just have done a drush updb:
$ drush updb [warning] Your PHP installation is too old. Drupal requires at least PHP /8.0/. It is recommended to upgrade to PHP version /8.0/ or higher for the best ongoing support. See PHP's version support documentation  and the Drupal PHP requirements  page for more information.  http://php.net/supported-versions.php  https://www.drupal.org/docs/system-requirements/php-requirements (Currently using PHP 7.4.33 ) [success] No pending updates. $ drush status Drupal version : 9.4.8 […] PHP binary : /usr/bin/php7.4 PHP config : /etc/php/7.4/cli/php.ini
So I select the php 8.0 version in this dropdown?
Or I do a:
Thanks to just confirm the process.