diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5289316..2edc308 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Change log
 
+### 0.2.13
+- Added default `version="1"` attribute to all nodes, ways, and relations generated during OSW→OSM conversion.
+- Introduced unit test coverage to verify version attributes are written for all OSM elements.
+
 ### 0.2.12
 - Updated OSMTaggedNodeParser to apply the OSW node and point filters with normalization before adding loose tagged nodes, ensuring non-compliant features like crossings are no longer emitted.
 - Extended serializer tests to cover the new tagged-node behavior, confirming that compliant kerb features are retained while schema-invalid crossings are skipped.
@@ -92,4 +96,4 @@
 - Added unit test cases
 - Added README.md file
 - Added CHANGELOG.md file
-- Added test.pypi pipeline
\ No newline at end of file
+- Added test.pypi pipeline
diff --git a/src/osm_osw_reformatter/osw2osm/osw2osm.py b/src/osm_osw_reformatter/osw2osm/osw2osm.py
index 8bfa2fb..505164b 100644
--- a/src/osm_osw_reformatter/osw2osm/osw2osm.py
+++ b/src/osm_osw_reformatter/osw2osm/osw2osm.py
@@ -1,5 +1,6 @@
 import gc
 import ogr2osm
+from xml.etree import ElementTree as ET
 from pathlib import Path
 from ..helpers.osw import OSWHelper
 from ..helpers.response import Response
@@ -32,6 +33,7 @@ def convert(self) -> Response:
             # Instantiate either ogr2osm.OsmDataWriter or ogr2osm.PbfDataWriter
             data_writer = ogr2osm.OsmDataWriter(output_file, suppress_empty_tags=True)
             osm_data.output(data_writer)
+            self._ensure_version_attribute(output_file)
 
             del translation_object
             del datasource
@@ -46,3 +48,19 @@ def convert(self) -> Response:
         finally:
             gc.collect()
         return resp
+
+    @staticmethod
+    def _ensure_version_attribute(osm_xml_path: Path) -> None:
+        """Ensure nodes, ways, and relations include a version attribute."""
+        try:
+            tree = ET.parse(osm_xml_path)
+        except Exception:
+            return
+
+        root = tree.getroot()
+        for tag in ('node', 'way', 'relation'):
+            for element in root.findall(f'.//{tag}'):
+                if not element.get('version'):
+                    element.set('version', '1')
+
+        tree.write(osm_xml_path, encoding='utf-8', xml_declaration=True)
diff --git a/src/osm_osw_reformatter/version.py b/src/osm_osw_reformatter/version.py
index 51e2f03..a53c568 100644
--- a/src/osm_osw_reformatter/version.py
+++ b/src/osm_osw_reformatter/version.py
@@ -1 +1 @@
-__version__ = '0.2.12'
+__version__ = '0.2.13'
diff --git a/tests/unit_tests/test_osw2osm/test_osw2osm.py b/tests/unit_tests/test_osw2osm/test_osw2osm.py
index f877fec..c46eb48 100644
--- a/tests/unit_tests/test_osw2osm/test_osw2osm.py
+++ b/tests/unit_tests/test_osw2osm/test_osw2osm.py
@@ -152,6 +152,19 @@ def test_invalid_incline_values_are_excluded(self):
         os.remove(result.generated_files)
         os.remove(zip_file)
 
+    def test_osm_elements_have_version_attribute(self):
+        zip_file = TEST_WIDTH_ZIP_FILE
+        osw2osm = OSW2OSM(zip_file_path=zip_file, workdir=OUTPUT_DIR, prefix='version')
+        result = osw2osm.convert()
+
+        tree = ET.parse(result.generated_files)
+        root = tree.getroot()
+
+        for element in root.findall('.//node') + root.findall('.//way') + root.findall('.//relation'):
+            self.assertEqual(element.get('version'), '1')
+
+        os.remove(result.generated_files)
+
 
 if __name__ == '__main__':
     unittest.main()