https://wccftech.com/galaxy-z-fold-3-and-z-flip-3-pick-up-november-2021-security-update/

Samsung has already rolled out the latest Android Security patch to Galaxy Note 20, Galaxy S20, and Galaxy S21. The South Korean firm has decided to push the update for the Galaxy Z Fold 3 and the Galaxy Z Flip 3. Both international and Korean models of the foldable devices are now getting the November 2021 security update.

For the international Galaxy Z Fold 3, you are looking at the firmware version F926BXXS1AUJB, and for the South Korean model, you are looking at F926NKSU1AUJ7 as the firmware version. The new security patch brings a lot of privacy and security bugs and has bug fixes that improve the phone's overall performance.