diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index fc1b3f39..e170fd92 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -132,7 +132,7 @@ jobs:
             os: ubuntu-latest
             toxenv-factors: '-current'
           - python-version: '3.9'   # lowest
-            os: ubuntu-latest
+            os: ubuntu-24.04 # no py3.8 on later
             toxenv-factors: '-lowest'
     steps:
       - name: Checkout
@@ -229,9 +229,14 @@ jobs:
           - "3.10"
           - "3.9"  # lowest supported -- handled in include
         exclude:
-          - os: macos-latest  # macos-latest is incompatible with some PY versions
+          - os: macos-latest
+            python-version: "3.10"
+          - os: ubuntu-latest
+            python-version: "3.9"
+        include:
+          - os: macos-15
             python-version: "3.10"
-          - os: macos-latest  # macos-latest is incompatible with some PY versions
+          - os: ubuntu-24.04
             python-version: "3.9"
     steps:
       - name: Checkout