Sony has started to roll out a new update to Xperia XZ, XZs and X Performance. The update changes the build number from 41.3.A.2.107 to version 41.3.A.2.128. The change log of the update does not provide any details of the update.
It brings the latest Android May security update to Xperia XZ, XZs and X Performance smartphones. After the update we did not find any other changes and Google has rolled out May security patch to Pixel devices a day back. The update is rolled out as OTA, it will take couple of days to hit all the devices. You can also manually check the update in settings-> about phone-> software update.