Azure Functions now supports .NET 9 preview 7 for applications using the isolated worker model and running on Linux plans.
To use .NET 9, Functions projects can adjust their target framework and update their references of Microsoft.Azure.Functions.Worker and Microsoft.Azure.Functions.Worker.Sdk to version 2.0.0-preview1 or later. Project code may need other changes in order to use these new versions. See the core packages documentation for details on these changes.
.NET 9 projects can be deployed to apps on Linux plans. These apps need to be configured to support .NET 9.
Learn more.