You can update your server's cPanel & WHM version easily through WHM's Upgrade to Latest Version interface or via the command line. You can also use the Update Preferences interface to configure your update settings for the next automatic update.
Update Preferences - https://docs.cpanel.net/whm/server-configuration/update-preferences/
Upgrade to Latest Version - https://docs.cpanel.net/whm/cpanel/upgrade-to-latest-version/
Product Versions and the Release Process - https://go.cpanel.net/releasetiers