Today Apple released the iOS 11.3.1 update, and the macOS 10.13.4 update. The iOS update includes a fix for a display bug that some users experienced with 3rd party replacement screens.
Both of the these are mainly security updates, and just be aware that the macOS update is fairly large and requires a lengthy restart. The download itself is around 1 Gigabyte and it took about 45 minutes for my MacBook Pro to restart after starting the update. So, make sure you will not need your Mac for a while before you do this update.