diff --git a/.github/workflows/test-dotnet.yml b/.github/workflows/test-dotnet.yml
index c1a6acb..b48fc32 100644
--- a/.github/workflows/test-dotnet.yml
+++ b/.github/workflows/test-dotnet.yml
@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         operating-system: [ubuntu-latest, windows-latest, macOS-latest]
-        dotnet-version: [2.1, 2.2, 3.1, 5.0]
+        dotnet-version: ['2.1', '2.2', '3.0', 3.1', '5.0']
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -28,4 +28,4 @@ jobs:
       - name: Setup dotnet ${{ matrix.dotnet-version }}
         uses: ./
         with:
-          dotnet-version: "${{ matrix.dotnet-version }}"
\ No newline at end of file
+          dotnet-version: ${{ matrix.dotnet-version }}
\ No newline at end of file