Applications using PHP 7.0 to 7.2 will be upgraded to PHP 7.4 automatically on December 1st, 2021.
PHP versions from 7.0 to 7.2 are vulnerable to security vulnerabilities as they will not receive security updates. You can find the list of end of life versions here: https://www.php.net/eol.php.
Affected customers will be e-mailed about this change and can contact our support team for any additional questions.