A new Sony Xperia XZ Premium update 47.1.A.12.75 is now available for download. The update includes Meltdown and Spectre vulnerabilities fixes.
The new update also includes Android February security patch which brings fixes for Common Vulnerabilities and Exposures (CVE) in the open-source Android OS. In addition, the firmware update also includes bug fixes and other improvements.
Software update 47.1.A.12.75 for Xperia XZ Premium smartphone will gradually release to everyone. You can also check manually for updates, go to Settings > About device > System update.
Make sure you have enough charge on your device at least 60% to 70% before downloading the update.