diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ae289c1..82b604d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -68,10 +68,10 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        # macos-13 uses x86_64, macos-14 aarch64
+        # macos-12 uses x86_64, macos-14 aarch64
         # see https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners/about-github-hosted-runners#supported-runners-and-hardware-resources
         include:
-          - os: macos-13
+          - os: macos-12
             arch: x86_64
             toolchain: x86_64-apple-darwin
           - os: macos-14