Updating cPanel and WHM to the latest version is not difficult. The best way is to use upcp script and ssh environment.
First, update the Linux operating system to:

yum update -y

Now run the following command:

/scripts/upcp –force

By executing the above command, WHM-cPanel control panel will start updating. This process may be a little long. You should not reset the server in the middle of the update. This process may take up to 20 minutes.

The second method to update cPanel to the latest version is as follows:

Enter the web host control panel or WHM

Now enter the Upgrade to Latest Version section and click on the Upgrade button. If you want to force the panel to run the upcp script before clicking on the Upgrade button, check the Force a reinstall even if the system is up to date check box and then click on the Upgrade button.

Both methods actually follow the same goal, but the first method through SSH is more recommended, because the update process is less likely to be interrupted.