The Sony Xperia XZs has received a minor update recently, which moved the build number from 41.3.A.2.234 to version 41.3.A.2.239. The only change that we can see with the latest update is the addition of 1 April 2019 Android security patches. We are probably coming towards the end of software support for the Xperia XZs, so it will be interesting to see how many more security patches Sony has in store for the XZs.
Leaked screenshots of Xperia T Android 4.3 firmware [9.2.A.0.278]
New ICS firmware (4.1.B.0.587) certified for six 2011 Xperia phones
Xperia ZL and Tablet Z receiving Android Lollipop update (10.6.A.0.454)
Xperia XZ Premium gets Netflix HDR support