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.NET 9 now available for RHEL and OpenShift

November 15, 2024
John Clingan Tom Deseyn
Related topics:
.NETLinuxOpen source
Related products:
Red Hat Enterprise LinuxRed Hat OpenShift

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    The .NET 9 release is now available, targeting Red Hat Enterprise Linux (RHEL) 8.10, RHEL 9.5, RHEL 10, and Red Hat OpenShift. Here's a quick overview of what developers need to know about this new major release.

    New features in .NET 9

    This release ships with the following features:

    • The software development kit (SDK) supports using the latest C# (C# 13) and F# (F# 9) versions.
    • The SDK now uses the new terminal logger by default which improves the usability of the .NET command-line interface.
    • The base library, garbage collection (GC), and just-in-time (JIT) have seen many performance improvements. The GC now defaults to the dynamic adaption to application sizes (DATAS) mode which resizes the heap based on the active workload.
    • .NET 9 comes with many API additions that improve performance, like overloads using the new C# 13 params Span, and allow C# 13 generic ref struct parameters to eliminate allocations. .NET 9 also includes many enhancements to its JSON support. For interoperability and efficient operations on AI data, .NET provides a new Tensor<T> type.
    • ASP.NET Core 9 comes with built-in support for OpenAPI document generation. Additionally, the new MapStaticAssets middleware provides optimized support for delivering static assets.

    How to install .NET 9

    You can install .NET 9 on RHEL with the usual command:

    # dnf install dotnet-sdk-9.0

    The .NET 9 SDK and runtime container images are available from the Red Hat Container Registry. You can use the container images as standalone images and with OpenShift on all supported architectures:

    $ podman run --rm registry.redhat.io/ubi8/dotnet-90 dotnet --version
    
    9.0.100

    Standard-term support for .NET 9

    The .NET 9 release provides standard-term support for 18 months. Support will be available until May 2026.

    Based on the .NET release schedule, the next version, .NET 10, will be a long-term support release. The release target date is November 2025, and it will provide three years of support.

    The existing .NET 6 and .NET 8 releases provide support until November 12th, 2024 and November 10th 2026, respectively.

    Additional support life cycle details are available on the .NET Life Cycle page.

    Last updated: June 11, 2025

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