https://wccftech.com/patch-tuesday-windows-10-update-is-out-for-v1909-and-others/

Windows 10 Patch Tuesday updates are live for this month bringing several security fixes and improvements. Today's cumulative updates are now available for the latest version 21H1, along with all the other supported versions of the operating system.

Along with the latest 3 versions that share a core operating system, including v21H1, v20H2, and v2004, the updates are now available for version 1909 (KB5005031 - Build 18363.1734), version 1809 (KB5005030 - Build 17763.2114), version 1607 (KB5005043 - Build 14393.4583), and the original Windows 10 version (KB5005040 - Build 10240.19022).