diff --git a/.github/workflows/test-lang-csharp-ARM.yml b/.github/workflows/test-lang-csharp-ARM.yml
index e6330a13268..951728aee0d 100644
--- a/.github/workflows/test-lang-csharp-ARM.yml
+++ b/.github/workflows/test-lang-csharp-ARM.yml
@@ -149,6 +149,7 @@ jobs:
           bash ./dotnet-install.sh --channel "6.0" --install-dir "$HOME/.dotnet" # 6.0
           bash ./dotnet-install.sh --channel "7.0" --install-dir "$HOME/.dotnet" # 7.0
           bash ./dotnet-install.sh --channel "8.0" --install-dir "$HOME/.dotnet" # 8.0
+          bash ./dotnet-install.sh --channel "9.0" --install-dir "$HOME/.dotnet" # 9.0
           
       - name: Build
         run: |