Microsoft will end support for its .NET 8 and .NET 9 platforms on November 10, 2026. The company advises current users of those platforms to upgrade to .NET 10.
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, 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. “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.” .NET 10 can be downloaded from dotnet.microsoft.com.
.NET 8 was released November 14, 2023, and .NET 9 was released November 12, 2024. .NET 10 became available November 11, 2025.
Microsoft said users of .NET 8 and .NET 9 could expect the following after November 10:
- Applications built on .NET 8 or .NET 9 will continue to run.
- No new security updates will be issued for either version.
- Staying on an unsupported version means exposure to security vulnerabilities that will not be patched.
- Technical support will no longer be available for .NET 8 or .NET 9 applications.
Also, beginning with a future servicing update for Visual Studio 2022, the .NET 8 and .NET 9 components will be marked as out of support. The arrival of the production release of .NET 11, meanwhile, is expected this November.
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