AWS Codebuild - Install .NET 9 SDK

Question

.NET 9 runtime isn't available (yet) for AWS Codebuild. Even after installing the SDK using the following commands, my build would still get .NET 6 instead:

version: 0.2
env:
  shell: bash
phases:
  install:
    commands:
      - curl -L https://dot.net/v1/dotnet-install.sh -o dotnet-install.sh
      - chmod +x ./dotnet-install.sh
      - ./dotnet-install.sh --channel 9.0 --install-dir /root/.dotnet/
      - dotnet --version
      - dotnet --info

Felipe Esteves · Accepted Answer · 2025-11-20 02:23:19Z

1

I found out that an extra command must be executed so dotnet's global.json gets updated properly with the latest SDK version:

dotnet new globaljson --sdk-version 9.0.308 --roll-forward latestFeature

Also the dotnet sdk must be installed in this folder:

/root/.dotnet/

My final code looks like this now:

version: 0.2
env:
  shell: bash
phases:
  install:
    commands:
      - curl -L https://dot.net/v1/dotnet-install.sh -o dotnet-install.sh
      - chmod +x ./dotnet-install.sh
      - ./dotnet-install.sh --channel 9.0 --install-dir /root/.dotnet/
      - dotnet new globaljson --sdk-version 9.0.308 --roll-forward latestFeature
      - dotnet --version
      - dotnet --info

answered 2 days ago

Felipe Esteves

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