.NET September 2021 Updates – 5.0.10 and 3.1.19

Sanket Kalaskar

Today, we are releasing the .NET September 2021 Updates. These updates contains reliability and other improvements. See the individual release notes for details on updated packages.

You can download 5.0.10 and 3.1.19 versions for Windows, macOS, and Linux, for x86, x64, Arm32, and Arm64.


Visual Studio

See release notes for Visual Studio compatibility for  .NET Core 3.1 and .NET 5.0.

OS Lifecycle update

Alpine 3.14 and Debian 11 “bullseye” are now supported with .NET 5.0.10 and .NET Core 3.1.19. Container images are also now available for Alpine 3.14 and Debian 11 “bullseye”.

The .NET 5.0 and .NET Core 3.1 operating system pages have been updated with the new support information.


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  • Mystery Man 0

    Hi. This post isn’t showing on the blog’s RSS feed.

  • Richard Deeming 0

    You’ve linked to the release notes for 3.1.19, but the only details I can see is a link to the “blog roundup”, which links back to this post. Does that mean there were no changes?

    • Mystery Man 0

      Actually here is a little more in the “3.1.19.md” file. It links back here, but it also says “.NET Core 3.1.19 release carries only non-security fixes.”

      • Richard Deeming 0

        Yes, but it would be nice to know what those fixes are. 🙂

        • Sanket KalaskarMicrosoft employee 0

          Thank you for notifying us. The blogpost is now updated with improvements for 3.1.19.

  • Ritesh Kulkarni 0

    Sanket Mitra, Windows Forms app linux var chalvayla kahi alternatives hya build madhe ?

    • Sanket KalaskarMicrosoft employee 0

      Ritesh, currently we only support WinForm apps on Windows you can check the Readme WinForms. If you are looking anything specific for Linux please feel free to provide us feedback on the WinForms repository.

  • schbaem 0

    Please update the documents when you do releases. The known issues for example are totally outdated. This is confusing.

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