Keeping your software up to date is one of the most important things you can do to maintain your Apple product's security.
The latest version of iPadOS is 26.3
Make sure your device is plugged in and connected to the internet with Wi-Fi. Then follow these steps:
Launch Settings app
Go to General
Select Software Update
Choose to Download and Install for iPadOS xx
After the install and restart in completed, go to
Settings -> General -> About
The iPadOS Version should show the latest version