diff --git a/.github/workflows/run-crt-test.yml b/.github/workflows/run-crt-test.yml
index 1e20b57f..50141892 100644
--- a/.github/workflows/run-crt-test.yml
+++ b/.github/workflows/run-crt-test.yml
@@ -12,7 +12,17 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13-dev"]
+        os: [ubuntu-latest, macOS-latest, windows-latest]
+        # Python 3.8 and 3.9 do not run on m1 hardware which is now standard for
+        # macOS-latest.
+        # https://github.com/actions/setup-python/issues/696#issuecomment-1637587760
+        exclude:
+        - { python-version: "3.8", os: "macos-latest" }
+        - { python-version: "3.9", os: "macos-latest" }
+        include:
+        - { python-version: "3.8", os: "macos-13" }
+        - { python-version: "3.9", os: "macos-13" }
 
     steps:
     - uses: actions/checkout@8f4b7f84864484a7bf31766abe9204da3cbe65b3
diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index de4bb8ef..92a8f7de 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -15,7 +15,17 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13-dev"]
+        os: [ubuntu-latest, macOS-latest, windows-latest]
+        # Python 3.8 and 3.9 do not run on m1 hardware which is now standard for
+        # macOS-latest.
+        # https://github.com/actions/setup-python/issues/696#issuecomment-1637587760
+        exclude:
+        - { python-version: "3.8", os: "macos-latest" }
+        - { python-version: "3.9", os: "macos-latest" }
+        include:
+        - { python-version: "3.8", os: "macos-13" }
+        - { python-version: "3.9", os: "macos-13" }
 
     steps:
     - uses: actions/checkout@8f4b7f84864484a7bf31766abe9204da3cbe65b3