diff --git a/.github/workflows/build-debug.yml b/.github/workflows/build-debug.yml
index 5a7eb3aa..e03ce3fe 100644
--- a/.github/workflows/build-debug.yml
+++ b/.github/workflows/build-debug.yml
@@ -15,10 +15,6 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: Cysharp/Actions/.github/actions/setup-dotnet@main
-        with:
-          dotnet-version: |
-            6.0.x
-            7.0.x
       - run: dotnet build -c Debug
       - run: dotnet test -c Debug
 
diff --git a/.github/workflows/build-release.yml b/.github/workflows/build-release.yml
index f4524018..13183a1b 100644
--- a/.github/workflows/build-release.yml
+++ b/.github/workflows/build-release.yml
@@ -34,10 +34,6 @@ jobs:
         with:
           ref: ${{ needs.update-packagejson.outputs.sha }}
       - uses: Cysharp/Actions/.github/actions/setup-dotnet@main
-        with:
-          dotnet-version: |
-            3.1.x
-            6.0.x
       # build and pack
       - run: dotnet build -c Release -p:Version=${{ env.GIT_TAG }}
       - run: dotnet test -c Release --no-build