diff --git a/tableauserverclient/server/endpoint/workbooks_endpoint.py b/tableauserverclient/server/endpoint/workbooks_endpoint.py
index 460017d1..53bf0c1a 100644
--- a/tableauserverclient/server/endpoint/workbooks_endpoint.py
+++ b/tableauserverclient/server/endpoint/workbooks_endpoint.py
@@ -280,7 +280,7 @@ def update(
         if include_view_acceleration_status:
             url += "?includeViewAccelerationStatus=True"
 
-        update_req = RequestFactory.Workbook.update_req(workbook_item)
+        update_req = RequestFactory.Workbook.update_req(workbook_item, self.parent_srv)
         server_response = self.put_request(url, update_req)
         logger.info(f"Updated workbook item (ID: {workbook_item.id})")
         updated_workbook = copy.copy(workbook_item)
diff --git a/tableauserverclient/server/request_factory.py b/tableauserverclient/server/request_factory.py
index f7bd139d..5849a8da 100644
--- a/tableauserverclient/server/request_factory.py
+++ b/tableauserverclient/server/request_factory.py
@@ -960,7 +960,7 @@ def _generate_xml(
                 _add_hiddenview_element(views_element, view_name)
         return ET.tostring(xml_request)
 
-    def update_req(self, workbook_item):
+    def update_req(self, workbook_item, parent_srv: Optional["Server"] = None):
         xml_request = ET.Element("tsRequest")
         workbook_element = ET.SubElement(xml_request, "workbook")
         if workbook_item.name:
@@ -973,6 +973,12 @@ def update_req(self, workbook_item):
         if workbook_item.owner_id:
             owner_element = ET.SubElement(workbook_element, "owner")
             owner_element.attrib["id"] = workbook_item.owner_id
+        if (
+            workbook_item.description is not None
+            and parent_srv is not None
+            and parent_srv.check_at_least_version("3.21")
+        ):
+            workbook_element.attrib["description"] = workbook_item.description
         if workbook_item._views is not None:
             views_element = ET.SubElement(workbook_element, "views")
             for view in workbook_item.views: