You can identify when CyberPanel needs updating by going to Version Management and then checking the page. It will indicate if an update is available:

Login to the server as the root user and then run the cyberpanel_utility command. If you see a message like the following, you will need to run the utility again.

Run the command again and then start the upgrade by selecting the upgrade option (typically #1).

You will then be able to run through the upgrade process like normal. This is similar to installing CyberPanel.