Copilot SWE can't run dotnet projects targeting anything greater than dotnet 8

[Gareth064]

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Dotnet 9 has been out for nearly a year now, but whenever I am using the coding agent to work on issues, it doesn't run the dotnet project, do make sure things compile or to run it and test its changes are working etc. This appears to be because the Linux VM's used only have dotnet 8 installed on them.

Is there a trick I am missing, or do we just have to wait for them to support newer versions of dotnet. 10 is just around the corner, so I am praying they support it when it releases.

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[VictorMoni]

Hi! @Gareth064

At the moment, the Copilot Coding Agent environments are limited to .NET 8, which is why your .NET 9 project won’t run or compile there.
There isn’t a workaround to force newer versions — it depends on GitHub updating the VM images.

For now:

• You can still use Copilot for code suggestions, but testing/compilation must be done locally with your installed .NET version.
• Keep an eye on GitHub’s release notes or the product feedback board for updates on .NET 9/10 support.

You’re not missing anything — it’s just not supported yet.

[Gareth064]

Can anyone from the Copilot team comment on whether the VMs used by the Coding Agent will get the .net10 update in a couple of months as it will the LTS?