Microsoft has released the first Windows 10 update of 2026, an important security patch called update KB5073724. This update is available for users of Windows 10 21H2, Windows 10 Enterprise LTSC 2021, and Windows 10 22H2 who have signed up for the Extended Security Updates (ESU) program.
Since Windows 10 no longer receives new features—only security-related fixes—update KB5073724 doesn’t bring any new features with it. KB5073724 is purely a security update that addresses newly discovered flaws in the Windows 10 operating system.
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What’s in update KB5073724?
Update KB5073724 includes security fixes that Microsoft previously pushed in December 2025 as part of KB5071546 and KB5074976:
- [Drivers] This update removes the following modem drivers: agrsm64.sys (x64), agrsm.sys (x86), smserl64.sys (x64) and smserial.sys (x86). Modem hardware that depends on these specific drivers will no longer work in Windows 10.
- [Secure Boot] Starting with this update, Windows quality updates include a subset of high-confidence device target data that identifies devices that can automatically receive new certificates for Secure Boot. Devices will only receive the new certificates after enough successful update signals have been verified to ensure a secure and phased rollout.
- [WinSqlite3.dll] Fixed: The Windows core component WinSqlite3.dll has been updated. Previously, some security software may have identified this component as vulnerable.
As of this writing, Microsoft doesn’t mention any issues relevant to private users that could cause problems when installing update KB5073724 on Windows 10 computers. The update might cause problems with Azure Virtual Desktop and Windows 365.
How to install this update
You can easily obtain update KB5073724 as part of the updates that Microsoft released on Patch Tuesday for January 2026. In this case, you don’t need to take any action—update KB5073724 will automatically be installed on your computer. If necessary, start a search for new updates in the Windows Update settings.
Or you can also get it directly from the Microsoft Update Catalog.