Sony Mobile has released a new firmware update for the Xperia X and Xperia X Compact, moving the build number to 34.2.A.2.47. We can see that this update includes the 1 April 2017 Android security patches. If you have noticed any other changes, please let us know in the comments below.
Thanks Akşemseddin, ch3mn3y, Hansa, Wile E. Cayote!