All of our servers now support PHP 7.4. You can read more in the official guide for migrating from PHP 7.3.x to PHP 7.4.x here:
PHP 7.4 brings performance improvements over previous PHP versions. From now all new accounts on our servers will have PHP 7.4 as the default PHP version. Existing accounts can be easily switched to PHP 7.4 via the hosting Control Panel > PHP Settings > Default PHP Version tab.