diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 343c49e7..b5b76be8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -83,7 +83,7 @@ jobs:
 
   test-mssql:
     name: mssql integration test
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix: