diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 117e6875..574dfd70 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,6 @@ jobs:
       matrix:
         os: [ubuntu-20.04, windows-latest, macos-latest]
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
-        tox-version: ["latest", "<4"]
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
@@ -37,8 +36,11 @@ jobs:
       - name: Install Nox-under-test
         run: |
           python -m pip install --disable-pip-version-check .
-      - name: Run tests on ${{ matrix.os }}
-        run: nox --non-interactive --error-on-missing-interpreter --session "tests(python='${{ matrix.python-version }}', tox_version='${{ matrix.tox-version }}')" -- --full-trace
+      - name: Run tests on ${{ matrix.os }} (tox <4)
+        run: nox --non-interactive --error-on-missing-interpreter --session "tests(python='${{ matrix.python-version }}', tox_version='<4')" -- --full-trace
+      - name: Run tox-to-nox tests on ${{ matrix.os }} (tox latest)
+        run: nox --non-interactive --error-on-missing-interpreter --session "tests(python='${{ matrix.python-version }}', tox_version='latest')" -- tests/test_tox_to_nox.py --full-trace
+        if: matrix.python-version != '3.7'
       - name: Save coverage report
         uses: actions/upload-artifact@v4
         with:
diff --git a/noxfile.py b/noxfile.py
index 3fdcbaa2..a7a665c7 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -33,6 +33,9 @@
     nox.options.sessions.append("conda_tests")
 
 
+# Because there is a dependency conflict between argcomplete and the latest tox
+# (both depend on a different version of importlibmetadata for Py 3.7) pip
+# installs tox 3 as the latest one for Py 3.7.
 @nox.session
 @nox.parametrize(
     "python, tox_version",
@@ -40,16 +43,11 @@
         (python, tox_version)
         for python in ("3.7", "3.8", "3.9", "3.10", "3.11", "3.12")
         for tox_version in ("latest", "<4")
+        if (python, tox_version) != ("3.7", "latest")
     ],
 )
 def tests(session: nox.Session, tox_version: str) -> None:
     """Run test suite with pytest."""
-    # Because there is a dependency conflict between
-    # argcomplete and the latest tox (both depend on
-    # a different version of importlibmetadata for Py 3.7)
-    # pip installs tox 3 as the latest one for Py 3.7.
-    if session.python == "3.7" and tox_version == "latest":
-        return
 
     coverage_file = (
         f".coverage.{sys.platform}.{session.python}.tox{tox_version.lstrip('<')}"