https://wccftech.com/patch-tuesday-windows-10-cumulative-update-kb4556799-out/

Microsoft has started rolling Windows 10 cumulative update for various versions of the operating system for the month of May. Today's Windows 10 updates are live for the November 2019 Update, version 1909, the May 2019 Update, version 1903, along with older versions of the operating system.

Windows 10 updates are also live for the October 2018 Update, version 1809 (KB4551853 - Build 17763.1217), the April 2018 Update, version 1803 (KB4556807 - Build 17134.1488), the Fall Creators Update, version 1709 (KB4556812 - Build 16299.1868), the Creators Update, version 1703 (KB4556804 - Build 15063.2375), the Anniversary Update, version 1607 (KB4556813 - Build 14393.3686), and the original Windows 10 (KB4556826 - Build 10240.18575).