Microsoft has officially ended support for the Windows 10 version 21H1 operating system, which was released in May 2021. The last patch Tuesday update released on December 13 was the latest batch of patches and fixes released by Microsoft for Windows 10 21H1.

In other words, computers running Windows 10 version 21H1 will no longer receive updates and security improvements.

Microsoft said:

As of December 13, 2022, all versions of Windows 10 version 21H1 have reached end of service. The December 2022 security update released on December 13 was the last update available for this version. Devices running this version will no longer receive monthly security updates and test updates containing protection against the latest security threats.

Microsoft is also launching an auto-update phase where devices with version 21H1 will be automatically upgraded to version 22H2, the latest version of Windows 10. Users will be able to choose a convenient time to restart their computer and complete the update. There is also an option to upgrade to Windows 11 immediately.