Apple has released iOs 11.3 last month and now a new update iOS 11.3.1 has been rolled out for all eligible iPhone, iPad, and iPod touch devices. The update weighs around 36MB in size. Change log of the update shows that it brings fix for rendered touch input unresponsive on iPhone 8 units with non-genuine replacement screens. And also update logs shows that it improves the security for the iPhone and iPads.
Apple has also released a security update to the recent macOS 10.13.4 update to macOS High Sierra. iOS 11.4 is already in beta testing, and the update is expected to release in late May or early June, which includes AirPlay 2 and Messages on iCloud.