When you update to the latest version of iPadOS, your data and settings remain unchanged.
Note: Before you update, set up iPad to back up automatically, or back up your iPad manually.
Update iPad automatically
If you didn’t turn on automatic updates when you first set up iPad, go to Settings > General > Software Update > Automatic Updates, then turn on Automatic Updates.
iPad automatically installs updates wirelessly, and you’re notified before the update occurs. To see the currently installed version of iPadOS, go to Settings > General > Software Update.
Update iPad manually
Go to Settings > General > Software Update > Automatic Updates, then turn off Automatic Updates.
At any time, you can check for and install software updates. Go to Settings > General > Software Update. The screen shows the currently installed version of iPadOS and whether an update is available.
Update using your computer
Do one of the following:
In the Finder sidebar on your Mac: Select your iPad, then click General at the top of the window.
Note: To use the Finder to update your iPad, macOS Catalina is required. With earlier versions of macOS, use iTunes to update your iPad.
In the iTunes app on your Windows PC: Click the iPad button near the top left of the iTunes window, then click Summary.
Click Check for Update.
To install an available update, click Update.
See the Apple Support articles Update to the latest iOS and If you can’t update or restore your iPhone, iPad, or iPod touch.