diff --git a/.github/workflows/web-conformance.yaml b/.github/workflows/web-conformance.yaml
index 610f18abb..c4a119b5e 100644
--- a/.github/workflows/web-conformance.yaml
+++ b/.github/workflows/web-conformance.yaml
@@ -42,7 +42,7 @@ jobs:
       - name: testwebfirefoxconformance
         run: make testwebfirefoxconformance
   safari:
-    runs-on: macos-11
+    runs-on: macos-12
     steps:
       - name: checkout
         uses: actions/checkout@v4