Microsoft released a new security update for Windows 10 that will bring your build number up to 1904x.1645.
The new update is for use on Windows 10, version 20H2, all editions of Windows Server, version 20H2, all editions of Windows 10, version 21H1, all editions of Windows 10, version 21H2, all editions.
Changelog for KB5012599 Windows 10 1904x.1645
This security update includes improvements that were a part of update KB5011543 (released March 22, 2022) and also addresses the following issues:
Addresses an issue that causes a Denial of Service vulnerability on Cluster Shared Volumes (CSV). For more information, see CVE-2020-26784.