Samsung Galaxy S21 series is now getting the Android 14 (One UI 6.0) update in the global market. Below check the complete changelog.
Galaxy S21 gets stable Android 14 update
The stable Android 14-based One UI 6.0 update for the Galaxy S21, Galaxy S21+, and Galaxy S21 Ultra comes with firmware version G99xBXXU9FWK2.
It is available in European countries, starting with Switzerland, and could be released to more countries soon.
If you have a Galaxy S21 series phone in Europe, you can start checking for the Android 14 update by navigating to Settings » Software update and tapping Download and install.