Sony mobile is currently pushing security update for Xperia X and X Compact smartphones. It will install the January (2017) month android security patch for these Xperia devices. The update comes with new build version 34.2.A.0.292. The download size of this system update will be 147.9MB.
The company is rolling out this firmware through OTA which requires WiFi or mobile data to download. The security update will be available for all variants of xperia x and x compact. Still you didn’t receive this patch update then go to Settings > About phone > Software update.