diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 46faaff3..ba54d7eb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,10 @@ jobs:
       - name: Setup dotnet
         uses: actions/setup-dotnet@v1
         with:
-          dotnet-version: 3.1.x
+          dotnet-version: |
+            2.1.x
+            3.1.x
+            6.0.x
       - name: Clean package cache as a temporary workaround for https://github.com/actions/setup-dotnet/issues/155
         working-directory: ./source
         run: dotnet clean -c Release && dotnet nuget locals all --clear