diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 8825373..a103e24 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -10,6 +10,12 @@ jobs:
       matrix:
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
         os: [ubuntu-latest, macos-latest, windows-latest]
+        exclude:  # Python < v3.8 does not support Apple Silicon ARM64.
+        - python-version: "3.7"
+          os: macos-latest
+        include:  # So run those legacy versions on Intel CPUs.
+        - python-version: "3.7"
+          os: macos-13
     env:
       OS: ${{ matrix.os }}
       PYHTHON: ${{ matrix.python-version }}
@@ -29,9 +35,10 @@ jobs:
           pip uninstall -y matplotlib
           pytest --cov=kneed --cov-report=xml:coverage2.xml tests/test_no_matplotlib.py
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           env_vars: OS,PYTHON
+          token: ${{ secrets.CODECOV_TOKEN }} # required
           fail_ci_if_error: true
           flags: unittests
           name: codecov-umbrella