Microsoft’s original HoloLens has received its monthly security update. The update is called “2020-04B Update for Windows 10 Version 1809 for x86-based Holographic Devices”
After installing the update the build number is 17763.1156.
The HoloLens is getting monthly updates but there are no feature updates coming to the device. The 1809 version of Windows 10 was due to go out of support in May but Microsoft have extended it until October.