https://www.bleepingcomputer.com/news/microsoft/windows-10-kb5003637-and-kb5003635-cumulative-updates-released/ > As part of the June 2021 Patch Tuesday, Microsoft has released new cumulative updates for all supported version of Windows, including Windows 10 KB5003637 & KB5003635 for the Windows 10 May 2021 Update and Windows 10 October 2020 Update. > The cumulative updates include security fixes for PCs with May 2021 Update, October 2020 Update and May 2020 Update. In this month's update, you can expect security fixes for the OS itself, browsers, core components and other basic functions.