diff --git a/.github/workflows/test_with_pytest.yml b/.github/workflows/test_with_pytest.yml
new file mode 100644
index 0000000..4febc7a
--- /dev/null
+++ b/.github/workflows/test_with_pytest.yml
@@ -0,0 +1,48 @@
+name: Test using pytest
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]  # Test on multiple Python versions
+    
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+
+        uses: actions/setup-python@v4
+        with:
+          # until saxonche is available in 3.13
+          # https://saxonica.plan.io/issues/6561
+          python-version: ${{ matrix.python-version }}
+      - name: Display Python version
+        run: python -c "import sys; print(sys.version)"
+
+      - name: Install dependencies
+        run: |
+          python -m venv venv
+          source venv/bin/activate
+          pip install --upgrade pip setuptools wheel
+          pip install .[h5py,netcdf,test]
+
+      - name: Run tests
+        run: |
+          source venv/bin/activate
+          python -m pytest -n=auto --cov=imas --cov-report=term-missing --cov-report=xml:coverage.xml --cov-report=html:htmlcov --junit-xml=junit.xml
+
+      - name: Upload coverage report ${{ matrix.python-version }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-report-${{ matrix.python-version }}
+          path: htmlcov
+
+      - name: Upload test report ${{ matrix.python-version }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-report-${{ matrix.python-version }}
+          path: junit.xml
diff --git a/imas/ids_convert.py b/imas/ids_convert.py
index f66f519..a52db52 100644
--- a/imas/ids_convert.py
+++ b/imas/ids_convert.py
@@ -533,7 +533,8 @@ def _add_provenance_entry(
         # DD version after IMAS-5304
         node.reference.resize(len(node.reference) + 1, keep=True)
         node.reference[-1].name = source_txt
-        timestamp = datetime.datetime.now(datetime.UTC).isoformat(timespec="seconds")
+        utc = getattr(datetime, "UTC", datetime.timezone.utc)
+        timestamp = datetime.datetime.now(utc).isoformat(timespec="seconds")
         node.reference[-1].timestamp = timestamp.replace("+00:00", "Z")
     else:
         # DD before IMAS-5304 (between 3.34.0 and 3.41.0)
diff --git a/imas/test/test_ids_convert.py b/imas/test/test_ids_convert.py
index 20dcd8c..750c44e 100644
--- a/imas/test/test_ids_convert.py
+++ b/imas/test/test_ids_convert.py
@@ -200,7 +200,8 @@ def test_provenance_entry(factory):
     timestamp = str(cp4.ids_properties.provenance.node[0].reference[0].timestamp)
     # Check that timestamp adheres to the format YYYY-MM-DDTHH:MM:SSZ
     assert re.match(r"\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}Z", timestamp)
-    dtime = datetime.now(UTC) - datetime.fromisoformat(timestamp)
+    timestamp_for_parsing = timestamp.replace("Z", "+00:00")
+    dtime = datetime.now(UTC) - datetime.fromisoformat(timestamp_for_parsing)
     assert timedelta(seconds=0) <= dtime < timedelta(seconds=2)