diff --git a/src/bcf/pyproject.toml b/src/bcf/pyproject.toml
index 4d7f1b401b..e126abe165 100644
--- a/src/bcf/pyproject.toml
+++ b/src/bcf/pyproject.toml
@@ -13,7 +13,7 @@ readme = "README.md"
 requires-python = ">=3.8"
 keywords = ["IFC", "BCF", "BIM"]
 dependencies = [
-    "xsdata",
+    "xsdata>=24.4",
     "numpy",
     "ifcopenshell",
 ]
diff --git a/src/bcf/src/bcf/xml_parser.py b/src/bcf/src/bcf/xml_parser.py
index 9f3878f769..ed13f747ce 100644
--- a/src/bcf/src/bcf/xml_parser.py
+++ b/src/bcf/src/bcf/xml_parser.py
@@ -10,7 +10,7 @@ from xsdata.formats.dataclass.serializers.config import SerializerConfig
 def build_xml_parser(context: Optional[XmlContext] = None) -> XmlParser:
     """Return a parser for an XML file."""
     parser = XmlParser(context=context or XmlContext())
-    parser.register_namespace("xs", "http://www.w3.org/2001/XMLSchema")
+    parser.register_namespace(ns_map=parser.ns_map, prefix="xs", uri="http://www.w3.org/2001/XMLSchema")
     return parser
 
 
@@ -68,7 +68,7 @@ class XmlParserSerializer:
         """
         return self.parser.from_bytes(xml, clazz)
 
-    def serialize(self, obj: T, ns_map: Optional[dict[str, str]] = None) -> str:
+    def serialize(self, obj: T, ns_map: Optional[dict[Optional[str], str]] = None) -> str:
         """
         Serialize an object to XML.
 
@@ -79,5 +79,5 @@ class XmlParserSerializer:
         Returns:
             The XML as string.
         """
-        ns_map = ns_map or {"xs": "http://www.w3.org/2001/XMLSchema"}
+        ns_map = ns_map or self.parser.ns_map or {"xs": "http://www.w3.org/2001/XMLSchema"}
         return self.serializer.render(obj, ns_map)