I received this message from my provider One.com
I have version 17 Pro of Website X5. What do I need to do?

PHP versions 5.6 and 7.0 approach the end of the road. PHP 5.6 will expire on December 31, 2018, and PHP 7.0 on December 3, 2018. This means that those versions will no longer be supported or updated. The decision has been taken by PHP.net and is beyond One.com's control.

The PHP version for your website tvtmotion.se is currently 5.6. We will upgrade it to PHP 7.2, which is the highest available version and guarantees you the longest service life. Your PHP version will automatically be upgraded during the first half of November.

After the upgrade, you will still be able to downgrade to PHP 5.6 and 7.0 temporarily. However, the downgrade will not be possible after 3 December. If your site has PHP 5.6 or 7.0, it will automatically upgrade to 7.2.

If you have a WordPress page, it is important that WordPress and all add-ons / plugins are updated to the latest version. You can do this with a few clicks in the dashboard in WordPress.