.NET9 is not supported

[MihailsKuzmins]

I try to run codeql for my .NET9 repository, but only .NET8 is installed, Is there any was to configure the installation of the .NET framework?

Run github/codeql-action/autobuild@v3
Attempting to automatically build csharp code
  Picked up JAVA_TOOL_OPTIONS:  -Dhttp.keepAlive=false -Dmaven.wagon.http.pool=false
  /opt/hostedtoolcache/CodeQL/2.20.7/x64/codeql/csharp/tools/autobuild.sh 
  CodeQL C# autobuilder
  .NET SDK:
   Version:           8.0.114
   Commit:            54ac9c88f1
   Workload version:  8.0.100-manifests.2d3000a2
  
  Runtime Environment:
   OS Name:     ubuntu
   OS Version:  24.04
   OS Platform: Linux
   RID:         ubuntu.24.04-x64
   Base Path:   /usr/lib/dotnet/sdk/8.0.114/
  
  .NET workloads installed:
   Workload version: 8.0.100-manifests.2d3000a2
  There are no installed workloads to display.
  
  Host:
    Version:      8.0.14
    Architecture: x64
    Commit:       1584e49360
  
  .NET SDKs installed:
    8.0.114 [/usr/lib/dotnet/sdk]
  
  .NET runtimes installed:
    Microsoft.AspNetCore.App 8.0.14 [/usr/lib/dotnet/shared/Microsoft.AspNetCore.App]
    Microsoft.NETCore.App 8.0.14 [/usr/lib/dotnet/shared/Microsoft.NETCore.App]
  
  Other architectures found:
    None
  
  Environment variables:
    Not set
  
  global.json file:
    Not found
  
  Learn more:
    https://aka.ms/dotnet/info
  
  Download .NET:
    https://aka.ms/dotnet/download
  MSBuild version 17.8.19+c3ade832a for .NET
  Build started 03/24/2025 13:53:29.
       1>Project "/home/runner/work/MudBlazor.Markdown/MudBlazor.Markdown/MudBlazor.Markdown.sln" on node 1 (Clean target(s)).
       1>ValidateSolutionConfiguration:
           Building solution configuration "Debug|Any CPU".
       1>Project "/home/runner/work/MudBlazor.Markdown/MudBlazor.Markdown/MudBlazor.Markdown.sln" (1) is building "/home/runner/work/MudBlazor.Markdown/MudBlazor.Markdown/tests/MudBlazor.Markdown.Tests/MudBlazor.Markdown.Tests.csproj" (2) on node 1 (Clean target(s)).
       2>Project "/home/runner/work/MudBlazor.Markdown/MudBlazor.Markdown/tests/MudBlazor.Markdown.Tests/MudBlazor.Markdown.Tests.csproj" (2) is building "/home/runner/work/MudBlazor.Markdown/MudBlazor.Markdown/tests/MudBlazor.Markdown.Tests/MudBlazor.Markdown.Tests.csproj" (2:3) on node 3 (Clean target(s)).
       2>/usr/lib/dotnet/sdk/8.0.114/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.TargetFrameworkInference.targets(166,5): error NETSDK10[45](https://github.com/MyNihongo/MudBlazor.Markdown/actions/runs/14036905899/job/39297010713?pr=293#step:4:46): The current .NET SDK does not support targeting .NET 9.0.  Either target .NET 8.0 or lower, or use a version of the .NET SDK that supports .NET 9.0. Download the .NET SDK from https://aka.ms/dotnet/download [/home/runner/work/MudBlazor.Markdown/MudBlazor.Markdown/tests/MudBlazor.Markdown.Tests/MudBlazor.Markdown.Tests.csproj::TargetFramework=net9.0]
       2>Done Building Project "/home/runner/work/MudBlazor.Markdown/MudBlazor.Markdown/tests/MudBlazor.Markdown.Tests/MudBlazor.Markdown.Tests.csproj" (Clean target(s)) -- FAILED.
       2>Project "/home/runner/work/MudBlazor.Markdown/MudBlazor.Markdown/tests/MudBlazor.Markdown.Tests/MudBlazor.Markdown.Tests.csproj" (2) is building "/home/runner/work/MudBlazor.Markdown/MudBlazor.Markdown/tests/MudBlazor.Markdown.Tests/MudBlazor.Markdown.Tests.csproj" (2:2) on node 1 (Clean target(s)).
       2>CoreClean:
           Creating directory "obj/Debug/net8.0/".
       1>Project "/home/runner/work/MudBlazor.Markdown/MudBlazor.Markdown/MudBlazor.Markdown.sln" (1) is building "/home/runner/work/MudBlazor.Markdown/MudBlazor.Markdown/src/MudBlazor.Markdown/MudBlazor.Markdown.csproj" (3) on node 2 (Clean target(s)).
       3>Project "/home/runner/work/MudBlazor.Markdown/MudBlazor.Markdown/src/MudBlazor.Markdown/MudBlazor.Markdown.csproj" (3) is building "/home/runner/work/MudBlazor.Markdown/MudBlazor.Markdown/src/MudBlazor.Markdown/MudBlazor.Markdown.csproj" (3:2) on node 2 (Clean target(s)).
       3>CoreClean:
           Creating directory "obj/Debug/net8.0/".
       3>Project "/home/runner/work/MudBlazor.Markdown/MudBlazor.Markdown/src/MudBlazor.Markdown/MudBlazor.Markdown.csproj" (3) is building "/home/runner/work/MudBlazor.Markdown/MudBlazor.Markdown/src/MudBlazor.Markdown/MudBlazor.Markdown.csproj" (3:3) on node 4 (Clean target(s)).
       3>/usr/lib/dotnet/sdk/8.0.114/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.TargetFrameworkInference.targets(1[66](https://github.com/MyNihongo/MudBlazor.Markdown/actions/runs/14036905899/job/39297010713?pr=293#step:4:67),5): error NETSDK1045: The current .NET SDK does not support targeting .NET 9.0.  Either target .NET 8.0 or lower, or use a version of the .NET SDK that supports .NET 9.0. Download the .NET SDK from https://aka.ms/dotnet/download

※ https://github.com/MyNihongo/MudBlazor.Markdown/actions/runs/14037056602/job/39297524543?pr=293

[mbg]

Hi @MihailsKuzmins 👋🏻

.NET 9 is supported by CodeQL. However, it is not pre-installed on the GitHub Actions runners and the error you are seeing is a generic .NET error for the wrong version. You can either use the setup-dotnet Action in your workflow to install .NET 9 on the runner. Alternatively, you can put a global.json file in your repository that targets .NET 9, which will cause CodeQL to install it for you.

[MihailsKuzmins]

@mbg thanks, the idea of adding setup-dotnet has not even crossed my mind.. By adding the following section to codeql.yaml the problem has been solved

- name: Install .NET 9
    uses: actions/setup-dotnet@v1
    with:
      dotnet-version: 9.0.x