diff --git a/.github/workflows/build_wheels.yml b/.github/workflows/build_wheels.yml
index 9b0f5590..add60bc5 100644
--- a/.github/workflows/build_wheels.yml
+++ b/.github/workflows/build_wheels.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-22.04, macos-12, macos-14, windows-2022]
+        os: [ubuntu-22.04, macos-13, macos-14, windows-2022]
     steps:
       - uses: actions/checkout@v4
       - if: runner.os == 'macOS'
diff --git a/.github/workflows/pip_install_gmpy2.yml b/.github/workflows/pip_install_gmpy2.yml
index b48203f8..d820bc2b 100644
--- a/.github/workflows/pip_install_gmpy2.yml
+++ b/.github/workflows/pip_install_gmpy2.yml
@@ -8,7 +8,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: [3.11, 3.12, 3.13]
-        os: [macos-12]
+        os: [macos-13]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4