diff --git a/.github/workflows/on_pr_test_python_31x.yml b/.github/workflows/on_pr_test_python_31x.yml
index 193cd80e4..f9134f0d4 100644
--- a/.github/workflows/on_pr_test_python_31x.yml
+++ b/.github/workflows/on_pr_test_python_31x.yml
@@ -24,7 +24,7 @@ jobs:
         scipy-version: ["1.8", "1.10"]
         # mpl-version: ["3.2", "3.3", "3.4", "3.5", "3.6"]
         mpl-version: ["3.2", "3.6"]
-        os: [ubuntu-latest, macos-11] # https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners
+        os: [ubuntu-latest, macos-11, macos-12] # https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners
         exclude:
         - python-version: "3.11"
           scipy-version: "1.8"
@@ -35,6 +35,11 @@ jobs:
           numpy-version: "1.24"
           scipy-version: "1.10"
           astropy-version: "5.0"
+        - os: macos-12            # URGENT: test_rm.py:test_binary fails
+          python-version: "3.11"
+          numpy-version: "1.24"
+          scipy-version: "1.10"
+          astropy-version: "5.0"
 
     name: ${{ matrix.os }} python${{ matrix.python-version}} numpy ${{ matrix.numpy-version }} scipy ${{ matrix.scipy-version }} astropy ${{ matrix.astropy-version}} mpl ${{ matrix.mpl-version }}
     steps:
diff --git a/.github/workflows/on_pr_test_python_38.yml b/.github/workflows/on_pr_test_python_38.yml
index 00cf9505c..7d69388d4 100644
--- a/.github/workflows/on_pr_test_python_38.yml
+++ b/.github/workflows/on_pr_test_python_38.yml
@@ -25,12 +25,16 @@ jobs:
         scipy-version: ["1.8", "1.10"]
         # mpl-version: ["3.2", "3.3", "3.4", "3.5", "3.6"]
         mpl-version: ["3.2", "3.6"]
-        os: [ubuntu-latest, macos-11]  # https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners
+        os: [ubuntu-latest, macos-11, macos-12]  # https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners
         exclude:
         - os: "macos-11"          # astropy failing to build. Ticket open.
           numpy-version: "1.18"
           scipy-version: "1.8"
           astropy-version: "3.0"
+        - os: "macos-12"          # astropy failing to build. Ticket amended.
+          numpy-version: "1.18"
+          scipy-version: "1.8"
+          astropy-version: "3.0"
         - mpl-version: "3.6"      # requires numpy 1.19+
           numpy-version: "1.18"
         - scipy-version: "1.10"   # requires numpy 1.19.5+
diff --git a/.github/workflows/on_pr_test_python_39.yml b/.github/workflows/on_pr_test_python_39.yml
index a1ebf4ecb..96d59960d 100644
--- a/.github/workflows/on_pr_test_python_39.yml
+++ b/.github/workflows/on_pr_test_python_39.yml
@@ -25,7 +25,7 @@ jobs:
         scipy-version: ["1.8", "1.10"]
         # mpl-version: ["3.2", "3.3", "3.4", "3.5", "3.6"]
         mpl-version: ["3.2", "3.6"]
-        os: [ubuntu-latest, macos-11]  # https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners
+        os: [ubuntu-latest, macos-11, macos-12]  # https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners
         exclude:
         - astropy-version: "4.0"  # requires numpy <=1.21
           numpy-version: "1.24"