diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index d524e11..ff851a8 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -33,6 +33,7 @@ jobs:
       uses: actions/setup-dotnet@v2
       with:
         dotnet-version: | 
+          3.1.x
           6.0.x
           8.0.x