Sony has started pushing out a new update to some of its smartphones. The update - currently hitting the Xperia XZ, XZs, and X Performance - bumps the build number from 41.3.A.2.107 to version 41.3.A.2.128 and includes the May security patch. There's currently no information if the update brings any new features or UI changes. As is usually the case with OTA roll outs, it might take time for the update notification to pop up on your device, so be patient. Via
Source: https://www.gsmarena.com/sony_xperia_xz_xzs_and_x_performance_getting_new_update-news-30912.php