Sony is rolling out a new update to Xperia XA Dual which includes the Android security patch for the month of September. The update is rolling out with the build number of 33.2.B.3.105 in India.
Moreover, Sony Xperia XA with Single SIM will also get Security update very soon. However, as usual the update over the air and it might take a couple of days to reach each and every user. Meanwhile, if you feel impatient, you can manually check for the update by heading to your handset’s Settings menu.