How to update safari on iPad
How can I update safari on my iPad
iPad, iPadOS 15
Safari is updated with the iOS version on your iPad.
Update your iPad to iOS 15.7 to get the most current version of Safari available. Link-> Update your iPhone or iPad - Apple Support
If you have already updated to iOS 15.7, then you already have the most up to date version of Safari for it. If some websites are issuing an error about it, then its the website that needs to update to correctly detect the new version of Safari. Specially if you use the Desktop mode to access websites.