diff --git a/.github/workflows/ci-daily.yml b/.github/workflows/ci-daily.yml
index d1f7606a5ed..4748c3d90c2 100644
--- a/.github/workflows/ci-daily.yml
+++ b/.github/workflows/ci-daily.yml
@@ -71,7 +71,8 @@ jobs:
     strategy:
       matrix:
         python-version: ['3.10', '3.11']
-    runs-on: macos-latest
+    # TODO(#6577): upgrade to macos-latest when it runs Python 3.10
+    runs-on: macos-13
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 13c7e397487..02a29248316 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -260,7 +260,8 @@ jobs:
     strategy:
       matrix:
         python-version: [ '3.10', '3.11' ]
-    runs-on: macos-latest
+    # TODO(#6577): upgrade to macos-latest when it runs Python 3.10
+    runs-on: macos-13
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5