diff --git a/samples/update_connection_auth.py b/samples/update_connection_auth.py
index 661a5e27..19134e60 100644
--- a/samples/update_connection_auth.py
+++ b/samples/update_connection_auth.py
@@ -51,7 +51,7 @@ def main():
         connection = connections[0]
         connection.username = args.datasource_username
         connection.password = args.datasource_password
-        connection.authentication_type = args.authentication_type
+        connection.auth_type = args.authentication_type
         connection.embed_password = True
 
         updated_connection = update_function(resource, connection)
diff --git a/samples/update_connections_auth.py b/samples/update_connections_auth.py
index 6ae27e33..f0c8dd85 100644
--- a/samples/update_connections_auth.py
+++ b/samples/update_connections_auth.py
@@ -35,7 +35,7 @@ def main():
     logging_level = getattr(logging, args.logging_level.upper())
     logging.basicConfig(level=logging_level)
 
-    tableau_auth = TSC.TableauAuth(args.token_name, args.token_value, site_id=args.site)
+    tableau_auth = TSC.PersonalAccessTokenAuth(args.token_name, args.token_value, site_id=args.site)
     server = TSC.Server(args.server, use_server_version=True)
 
     with server.auth.sign_in(tableau_auth):
diff --git a/tableauserverclient/server/request_factory.py b/tableauserverclient/server/request_factory.py
index 45da6605..f17d579a 100644
--- a/tableauserverclient/server/request_factory.py
+++ b/tableauserverclient/server/request_factory.py
@@ -1162,6 +1162,8 @@ def update_req(self, xml_request: ET.Element, connection_item: "ConnectionItem")
             connection_element.attrib["userName"] = connection_item.username
         if connection_item.password is not None:
             connection_element.attrib["password"] = connection_item.password
+        if connection_item.auth_type is not None:
+            connection_element.attrib["authenticationType"] = connection_item.auth_type
         if connection_item.embed_password is not None:
             connection_element.attrib["embedPassword"] = str(connection_item.embed_password).lower()
         if connection_item.query_tagging is not None:
diff --git a/test/test_datasource.py b/test/test_datasource.py
index 5e7e9135..d36ddab7 100644
--- a/test/test_datasource.py
+++ b/test/test_datasource.py
@@ -255,6 +255,7 @@ def test_update_connections(self) -> None:
             updated_ids = [conn.id for conn in connection_items]
 
             self.assertEqual(updated_ids, connection_luids)
+            self.assertEqual("auth-keypair", connection_items[0].auth_type)
 
     def test_populate_permissions(self) -> None:
         with open(asset(POPULATE_PERMISSIONS_XML), "rb") as f:
diff --git a/test/test_workbook.py b/test/test_workbook.py
index f6c494f9..a4242c21 100644
--- a/test/test_workbook.py
+++ b/test/test_workbook.py
@@ -1012,6 +1012,7 @@ def test_update_workbook_connections(self) -> None:
             updated_ids = [conn.id for conn in connection_items]
 
             self.assertEqual(updated_ids, connection_luids)
+            self.assertEqual("AD Service Principal", connection_items[0].auth_type)
 
     def test_get_workbook_all_fields(self) -> None:
         self.server.version = "3.21"