Update .NET SDK

[DaleMckeown]

Tool name

.NET SDK

Tool license

https://dotnet.microsoft.com/en-us/download/dotnet/9.0

Add or update?

• Add
• Update

Desired version

.NET9

Approximate size

No response

Brief description of tool

.NET SDK needs updating to include the recently released .NET 9 framework.

URL for tool's homepage

https://dotnet.microsoft.com/en-us/download/dotnet/9.0

Provide a basic test case to validate the tool's functionality.

No response

Platforms where you need the tool

• Azure DevOps
• GitHub Actions

Runner images where you need the tool

• Ubuntu 20.04
• Ubuntu 22.04
• Ubuntu 24.04
• macOS 12
• macOS 13
• macOS 13 Arm64
• macOS 14
• macOS 14 Arm64
• macOS 15
• macOS 15 Arm64
• Windows Server 2019
• Windows Server 2022

Can this tool be installed during the build?

No response

Tool installation time in runtime

No response

Are you willing to submit a PR?

No response

[vidyasagarnimmagaddi]

Hi @DaleMckeown , .Net version 9 will be added in next image roll out. thanks

[thomasbach-dk]

Could this be updated to include macos runners aswell?

[DaleMckeown]

@thomasbach-dk My understanding is they have some specific rules for macOS images, IIRC only 1 version of .NET is allowed on them. It will likely be a decision for MSFT to make themselves when they want to swap 8 out for 9, so I don't want it to hold up the rest of the images from being deployed with .NET9.

Feel free to submit a separate PR targeting macOS specifically.

[gkizior]

Hi @DaleMckeown , .Net version 9 will be added in next image roll out. thanks

ETA?

[artiomchi]

@DaleMckeown wait what? I never heard of something like that. Even the existing macos runners have multiple .NET versions installed.

e.g. https://github.com/actions/runner-images/blob/main/images/macos/macos-14-Readme.md#language-and-runtime

[michal-zatloukal]

Any update on this? Quite sad to see anyone using GitHub runners in CI not being able to use already released .NET 9 without having to install it every time.

[DaleMckeown]

@vidyasagarnimmagaddi When will the new image be released? People want to start using .NET 9.

[sdcb]

actually Windows runner is using .NET 9 while others is using .NET 8

[michaelmairegger]

I don't get it why every year with each new .NET version we have to use the workaround of manually installing the .NET in the existing images. Why is Microsoft not able to release new runner-images on release date? I think every developer hopes that on day-0 the whole ecosystem is .NET9 ready.

[DaleMckeown]

@michaelmairegger It'd be nice if the images were ready for day-0. .NET 9 was release nearly 2 weeks ago now. You'd imagine many people are using GitHub actions/ DevOps pipelines to deploy their applications.

I guess MSFT is a huge organisation (over 230,000 employees apparently) and the thinking is not as joined up as it could/should be.