From Sigma:
Firmware update for SIGMA 14-24mm F2.8 DG DN | Art for Sony E-mount
Thank you for purchasing and using our products.
We are pleased to announce that a new firmware update for the SIGMA 14-24mm F2.8 DG DN | Art for Sony E-mount is now available.
Applicable product
Benefit of the update
To update the firmware, please refer to this link.