Hi there!

Thanks for your query.

Actually, the PHP version update can not be handled by us. Kindly, ask hosting support, your hosting provider can help you to update.

However, you will get many blogs about it online. For example:

https://magazine.joomla.org/all-issues/september-2020/how-do-i-update-my-php-version

https://www.joomlashine.com/blog/update-php-in-joomla.html

Best Regards