How do I update Safari on my Apple ipad

I have a new iPad Pro with Safari. Everytime I go on Twitter, I get a message that my browser needs to be updated to one in a list that the message gives me. One of the browsers in the list is Safari. I already have Safari. Why do I keep getting this message?

If your iPad is capable of running a newer iOS version, install it. If not, check for alternative browsers in the App Store, or get a more-recent iPad.

(183844)

Safari is updated when you install iOS updates.

Safari cannot be updated on it's own.