PHP 8.0 is now available to upgrade-to. Also, PHP 7.4 has been updated to 7.4.13 and 7.3 to 7.3.25.
PHP 8.0 is a major revision, please that you test your site thoroughly after the upgrade. With WordPress it’s only ‘beta compatible’. Please see this post from WordPress.
Information on PHP changes can be found on PHP.net.