diff --git a/.github/templates/main.yml b/.github/templates/main.yml
index 84bde6d4dc..d0e9f36e3a 100644
--- a/.github/templates/main.yml
+++ b/.github/templates/main.yml
@@ -360,7 +360,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ macos-latest, windows-latest, ubuntu-latest ]
+        os: [ macos-latest, windows-latest, ubuntu-latest, win81 ]
         targetFramework: [ netcoreapp3.1, net5.0, net6.0 ]
     steps:
       - #@ template.replace(checkoutCode())
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 10ffd4dbb5..4fcf272f66 100755
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -527,6 +527,7 @@ jobs:
         - macos-latest
         - windows-latest
         - ubuntu-latest
+        - win81
         targetFramework:
         - netcoreapp3.1
         - net5.0