As with any update process, it's recommended that you back up your Raspberry Pi just in case. Fortunately, we have a guide for that!
Open the OctoPrint interface in your browser, as you normally would. If there's an update available, a modal will appear automatically.
Click Update now to begin the update process. Then, click Proceed to confirm.
OctoPrint will prompt you when it's time to reload your browser. If you run into any issues, simply restore your SD card backup using an application such as Etcher.
You're all done!