Go to Settings > General > Software Update. Wait for your device to check for new updates, download and install them.

How do I update my Notes on my iPhone?

Set up Notes with iCloud

You can use iCloud to update your notes across all of your devices. To set up Notes with iCloud, go to Settings > [your name] > iCloud, then turn on Notes. You’ll see your notes on all of your Apple devices that you’re signed in to with the same Apple ID.

Why won’t my apple Notes update?

To make sure Notes syncing is turned on from an iOS device, go to Settings → Apple ID → iCloud → Notes and make sure the switch is turned to “on.” If it’s off, then turn it back on again and check back later after it’s had some time to sync.