diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 42652909..18849cf2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
       matrix:
         std: [98, 11, 14, 17, 20]
         config: [Debug, Release]
-        os: [windows-latest, ubuntu-latest, macos-latest]
+        os: [ubuntu-latest, ubuntu-20.04, macos-latest, macos-11, windows-latest, windows-2019]
 
     steps:
       - run: echo "🎉 The job was automatically triggered by a ${{ github.event_name }} event."