Today is Patch Tuesday, and Microsoft is releasing security updates to all supported versions of Windows - including the last ones ever for Windows 7. To go along with that, the company has also released a new update for Insiders in the Slow Ring, who are currently testing the upcoming 20H1 update for Windows 10. Since the update has been finalized in terms of features, the security updates are arriving as a cumulative update rather than a completely new build.
The new update brings the build number up to 19041.21 and since it's all about security fixes, there's nothing else of note in this release. Here's what's included:
Security updates to Windows App Platform and Frameworks, Windows Input and Composition, Windows Graphics, Microsoft Scripting Engine, .NET Framework, Windows Cryptography, Windows Subsystem for Linux, Windows Peripherals, Windows Storage and Filesystems, and Windows Server.
Insiders in the Slow Ring will continue to test the 20H1 update for Windows 10 for the next few weeks in preparation for a public release, which should happen around April or so. At some point before then, Insiders in the Release Preview ring will also get to test the update for a while.
If you want to test the latest new features for Windows 10, the Fast ring is where you'll want to be, but keep in mind that the Fast ring isn't tied to a specific version of Windows 10 anymore. Microsoft plans to release the latest bits of code from its teams into the Fast ring, and features may be added or removed at any time before they make their way to a public release of the OS.