Sony has started rolling out a new update to its Xperia M4 Aqua smartphone. The update - which is hitting all variants of the device, and bumps the build number from 26.3.X.0.131 to 26.3.X.1.33 - brings Android security patch for the month of July. As is usually the case with OTA roll-outs, it may take some time for the update to hit your device. Meanwhile, if you feel impatient, you can manually check for the update by heading to your handset's Settings menu. Via
Source: http://www.gsmarena.com/sony_xperia_m4_aqua_receives_new_security_update-news-21235.php