diff --git a/pynxtools/dataconverter/helpers.py b/pynxtools/dataconverter/helpers.py
index 199dec181..c310aaf09 100644
--- a/pynxtools/dataconverter/helpers.py
+++ b/pynxtools/dataconverter/helpers.py
@@ -27,6 +27,7 @@
 from ase.data import chemical_symbols
 import h5py
 
+from pynxtools import get_nexus_version
 from pynxtools.nexus import nexus
 from pynxtools.nexus.nexus import NxdlAttributeError
 
@@ -591,7 +592,7 @@ def add_default_root_attributes(data, filename):
     data["/@file_name"] = filename
     data["/@file_time"] = str(datetime.now(timezone.utc).astimezone())
     data["/@file_update_time"] = data["/@file_time"]
-    data["/@NeXus_version"] = "NOT_IMPLEMENTED"
+    data["/@NeXus_version"] = get_nexus_version()
     data["/@HDF5_version"] = '.'.join(map(str, h5py.h5.get_libversion()))  # pylint: disable=c-extension-no-member
     data["/@h5py_version"] = h5py.__version__