I want to update my iPhone

Hello,

Here are two different ways to ensure the highest iOS that your device will support is on your device.

Update your iPhone, iPad, or iPod touch wirelessly. Click here --> Update your iPhone or iPad - Apple Support

Here are instructions about how to update your iPhone, iPad, or iPod touch with the Finder on a Mac computer --> Update your iPhone, iPad, or iPod touch with the Finder - Apple Support

iOS 16.3 is the latest update for an iPhone 13. If yours is not updated to that, see instructions in Update your iPhone or iPad - Apple Support