A new update has started rolling out to Sony Xperia Z5 series devices as well as the Z3 Plus. The update bumps the build number to 32.2.A.0.253, and brings along Bluetooth-related improvements as well as some bug fixes. Specifically, the update features improved handling of Bluetooth devices. Information such as the size of the update as well as which countries/markets are currently getting it isn't yet known. This comes less than a couple of weeks after the Xperia Z5 family received an update that brought back the Stamina Mode. Via
Source: http://www.gsmarena.com/new_update_hitting_xperia_z5_and_z3_plus_devices-news-19370.php