Today Apple has releases iOS and iPadOS 14.4.1 for iPhone and iPad with minor bug fixes and some security issues resolved. Apple is recommending the update to all users as there is an issue wit WebKit which could allow maliciously crafted web content to execute code on the device.

Updating iOS and iPadOS can be done on device by going to Settings > General > Software Update. On Mac and PC by going to iTunes and on newer macOS releases, via the Finder.