As per the recent post on Apple Support, dated October 25, 2021, Apple has released a new update for iOS and iPadOS that includes important new security fixes. The new update includes security patches that correct issues which allow malicious actors to execute unauthorized code on your device, or malicious websites to get private information from your device.
We advise you update your iOS and iPadOS devices at home and at work, (campus and personal) before you use them.
For information on how to update your iOS or iPadOS devices see the Apple Support page, Update your iPhone, iPad, or iPod touch.