Sony Xperia XZ 41.3.A.2.75 update is now available for download. The new patch has added fixes for the Spectre and Meltdown CPU vulnerabilities. In addition, Android security patches for the month of February is also now available.
The latest Android February Security patch fixes Common Vulnerabilities and Exposures (CVE) in the open-source Android OS. Recently, Android 8.0 Oreo update was also released on the Xperia XZ, however, there are some reports of degraded performance and battery life issues.
Sony Xperia XZ 41.3.A.2.75 update software 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.