End of support looms for .NET 8 and .NET 9

Microsoft will end support for .NET 8 and .NET 9 on November 10, 2026, urging users to upgrade to .NET 10, an LTS release supported through November 2028. After that date, no security updates or technical support will be provided for the older platforms.

Microsoft will end support for its .NET 8 and .NET 9 platforms on November 10 https://github.com/dotnet/core/blob/main/release-notes/README.md , 2026. The company advises current users of those platforms to upgrade to .NET 10 https://www.infoworld.com/article/4087667/microsofts-net-10-arrives-with-ai-runtime-and-language-improvements.html . After November 10, Microsoft will no longer provide servicing updates, security fixes, or technical support for .NET 8 and .NET 9. “We recommend upgrading to .NET 10 https://devblogs.microsoft.com/dotnet/announcing-dotnet-10/ , which is an LTS long term support release supported through November 2028,” said Rahul Bhandari, Microsoft senior program manager in a June 29 blog post https://devblogs.microsoft.com/dotnet/dotnet-8-9-end-of-support/ . “By upgrading, you will continue receiving security updates and servicing fixes to keep your applications protected.” Apps can be upgraded to .NET 10 by changing the value of the TargetFramework property in a project file to net10.0 . Development and hosting environments will need to be updated. This process is covered in detail in Microsoft’s article, “ Upgrade to a new .NET version https://learn.microsoft.com/dotnet/core/install/upgrade .” .NET 10 can be downloaded from dotnet.microsoft.com https://dotnet.microsoft.com/en-us/download/dotnet/10.0 . .NET 8 https://www.infoworld.com/article/2335555/the-best-new-features-in-microsoft-net-8.html was released November 14, 2023, and .NET 9 https://www.infoworld.com/article/3603700/microsofts-net-9-arrives-with-performance-cloud-and-ai-boosts.html was released November 12, 2024. .NET 10 https://www.infoworld.com/article/3839444/the-key-new-features-in-net-10.html became available November 11, 2025. Microsoft said users of .NET 8 and .NET 9 could expect the following after November 10: Also, beginning with a future servicing update for Visual Studio 2022 https://www.infoworld.com/article/2270802/microsoft-visual-studio-2022-arrives.html , the .NET 8 and .NET 9 components will be marked as out of support. The arrival of the production release of .NET 11 https://www.infoworld.com/article/4138881/under-the-hood-with-net-11-preview-1.html , meanwhile, is expected this November.