diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2c88e3f3..c5d47939 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -38,7 +38,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.6", "3.8", "3.11", "3.12"]
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os: [ubuntu-latest, windows-latest, macos-13]
         include:
         - python-version: 'pypy-3.8'
           os: ubuntu-latest