This page explains how to migrate the Headless Server Software to .NET 9.
This update is fairly straightforward and doesn't requires any configuration changes.
Migration steps
Baremetal
When running the Headless Server Software baremetal, you will need to make sure the .NET 9 Runtime is installed.
Docker
When using Docker, make sure to build your image using mcr.microsoft.com/dotnet/runtime:9.0.