https://www.bleepingcomputer.com/news/microsoft/windows-10-june-2019-cumulative-updates-released-with-fixes/

Microsoft has released the first June 2019 cumulative updates for compatible Windows 10 versions, including May 2019 Update. Windows 10 May 2019 Update, Windows 10 October 2018 Update and April 2018 Update are also receiving new cumulative updates today.

It's important to note that the focus of Windows 10's June 2019 cumulative update is on addressing the security issues. Microsoft hasn't fixed any other major problems in the operating system and the changelog is also tiny.