Retirement: Support for .NET 9 (STS) ends on November 10, 2026

On 10 November, 2026, support for .NET 9 (STS) will end. Your apps that are hosted on App Service will continue to run, but security updates will no longer be available and we’ll no longer provide customer service for .NET 9 (STS). Learn more about App Service language support.  

Required Action  

To avoid potential security vulnerabilities and minimize risk for your App Service apps, follow the steps to upgrade your app to .NET 10 (LTS) before 10 November, 2026.  

More Information 

If you have questions, get answers from community experts in Microsoft Q&A. If you have a support plan and you need technical help, create a support request.