https://www.bleepingcomputer.com/news/microsoft/windows-10-kb5007186-and-kb5007189-updates-released/

The new update is now available for Windows 10 version 2004, version 20H2 and version 21H1. As per the official release notes, Microsoft has published cumulative updates KB5007186 and KB5007189.

This month's cumulative updates apparently include security fixes for May 2021 Update (version 21H1), October 2020 Update (version 20H2), and May 2020 Update (version 2004). It's also the second last security update for version 2004, which is set to reach the end of service in December.