The upgrade process for WordPress is quite simple and you can do it by single click on a button! However, before initiating an upgrade of your application, we strongly recommend making a full backup of your WordPress.
Once you make sure you have a backup stored on your local computer, you may proceed with the upgrade of your WordPress application by logging into the administrative dashboard. Once you have logged into the backend, WordPress will notify you if an upgrade was released, and if so a link with an upgrade will be provided on the page. Just click on the link and the upgrade will start and automatically perform the needed changes to your script.