diff --git a/.github/workflows/ci-tests.yaml b/.github/workflows/ci-tests.yaml
index 66b953b..326fb57 100644
--- a/.github/workflows/ci-tests.yaml
+++ b/.github/workflows/ci-tests.yaml
@@ -14,15 +14,15 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.6']
+        python-versions: ['3.6']
 
     steps:
       - uses: actions/checkout@v4 # https://github.com/actions/cache/releases
 
-      - name: Set up Python ${{ matrix.python-version }}
+      - name: Set up Python ${{ matrix.python-versions }}
         uses: actions/setup-python@v5 # https://github.com/actions/setup-python/releases
         with:
-          python-version: ${{ matrix.python-version }}
+          python-version: ${{ matrix.python-versions }}
 
       - name: Install Pipenv
         run: |
@@ -33,15 +33,17 @@ jobs:
         run: |
           pipenv install --deploy --dev
 
+      - name: Check minimum required Python version
+        run: |
+          vermin -q -t=${{ matrix.python-versions }}- --violations cis_audit.py
+
       - name: Lint with flake8
         run: |
-          pipenv run flake8 *.py
-          pipenv run flake8 tests/*/*.py
+          pipenv run flake8 *.py tests/*/*.py
 
       - name: Format with black
         run: |
-          pipenv run black --check cis_audit.py
-          pipenv run black --check tests/*/*.py
+          pipenv run black --check cis_audit.py tests/*/*.py
 
       - name: Test with pytest
         run: |
@@ -49,7 +51,7 @@ jobs:
           pipenv run coverage xml
 
       #- name: Codecov
-      #  uses: codecov/codecov-action@v3  # https://github.com/codecov/codecov-action/releases
+      #  uses: codecov/codecov-action@v4  # https://github.com/codecov/codecov-action/releases
       #
       #  with:
       #    files: coverage.xml
@@ -64,7 +66,7 @@ jobs:
     if: ${{ false }}  # disable for now
 
     steps:
-      - uses: actions/checkout@v4 # https://github.com/actions/cache/releases
+      - uses: actions/checkout@v4 # https://github.com/actions/checkout/releases
 
       - name: Cache Vagrant boxes
         uses: actions/cache@v4 # https://github.com/actions/cache/releases
diff --git a/cis_audit.py b/cis_audit.py
index 99c6e7f..afacd72 100755
--- a/cis_audit.py
+++ b/cis_audit.py
@@ -2377,7 +2377,7 @@ def output_text(results, host_os, benchmark_version, stats):
     print(f'Passed {passed} of {total} tests in {duration} seconds ({skipped} Skipped, {errors} Errors)')
 
 
-def result_stats(results: dict, start_time, end_time) -> dict:
+def result_stats(results: "list[dict]", start_time, end_time) -> dict:
     passed = 0
     failed = 0
     skipped = 0
@@ -2385,7 +2385,7 @@ def result_stats(results: dict, start_time, end_time) -> dict:
 
     time_delta = (end_time - start_time).total_seconds()
     if time_delta >= 10:
-        duration = round(time_delta, 0)
+        duration = round(time_delta, None)
     else:
         duration = round(time_delta, 2)
 
diff --git a/tests/unit/test_result_stats.py b/tests/unit/test_result_stats.py
new file mode 100644
index 0000000..4774874
--- /dev/null
+++ b/tests/unit/test_result_stats.py
@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+
+from datetime import datetime
+
+import pytest
+
+from cis_audit import result_stats
+
+
+@pytest.mark.parametrize(
+    "end_time_str,expected_duration",
+    [
+        pytest.param("1970-01-01T00:01:00+0000", "60", id="slow"),
+        pytest.param("1970-01-01T00:00:05+0000", "5.0", id="fast"),
+    ],
+)
+def test_result_stats(end_time_str, expected_duration):
+    results = [
+        {'result': "Error"},
+        {'result': "Fail"},
+        {'result': "Fail"},
+        {'result': "Not Implemented"},
+        {'result': "Pass"},
+        {'result': "Pass"},
+        {'result': "Pass"},
+        {'result': "Skipped"},
+    ]
+    datefmt = "%Y-%m-%dT%H:%M:%S%z"
+    start_time = datetime.strptime("1970-01-01T00:00:00+0000", datefmt)
+    end_time = datetime.strptime(end_time_str, datefmt)
+
+    stats = result_stats(results=results, start_time=start_time, end_time=end_time)
+
+    assert str(stats['duration']) == expected_duration
+    assert stats['errors'] == 1
+    assert stats['failed'] == 2
+    assert stats['passed'] == 3
+    assert stats['skipped'] == 1
+
+    # assert stats is None
+
+
+if __name__ == "__main__":
+    pytest.main([__file__, "--no-cov"])