https://wccftech.com/microsoft-kb4462933-windows-10-april-2018-update/

Following the regular Patch Tuesday updates, Microsoft had pushed out some more fixes to the older versions of the operating system. However, the latest Windows 10 October 2018 Update and the April 2018 Update were left out. Microsoft has now started rolling out Build 17134.376 (KB4462933) to Windows 10 April 2018 Update version 1803. There’s still no word on the public re-release of version 1809, which received its first cumulative update on October 9.

Microsoft has assured there are no known issues with the build being sent to Windows 10 1803 and that it addresses general issues and adds quality improvements. Here’s the complete changelog: