Linux: Upgrade: 6.0.0 to 6.1.0 - no mention of php upgrade

In the upgrade instructions for Linux from 6.0.0 to 6.1.0, there is no mention of the PHP upgrade that is required? Are database and OS upgrades also required?
I’m getting an error after I followed the upgrade instructions:
PHP version needs to be at least 7.4.0.
–RBL