diff --git a/Claude outputs/main.py b/Claude outputs/main.py
index 0c8eeb3..a39f77f 100644
--- a/Claude outputs/main.py	
+++ b/Claude outputs/main.py	
@@ -609,6 +609,7 @@ async def update_order(order_id: int, customer: str = None, description: str = N
         "description": description if description is not None else current_card.get("description", ""),
         "type": current_card.get("type", "plain"),
         "order": current_card.get("order", 999),
+        "owner": current_card["owner"],
     }
     if due_date is not None:
         body["duedate"] = _as_calendar_local(datetime.fromisoformat(due_date)).isoformat()
diff --git a/Claude outputs/tests/test_orders.py b/Claude outputs/tests/test_orders.py
index 1c86fd6..7156fa8 100644
--- a/Claude outputs/tests/test_orders.py	
+++ b/Claude outputs/tests/test_orders.py	
@@ -379,7 +379,7 @@ def test_orders_endpoint_returns_503_on_deck_error(client):
 
 _STACKS_WITH_CARD_55 = [
     {"id": 1, "title": "Offen", "cards": [
-        {"id": 55, "title": "Feuerwehr Onza", "description": "Helme", "duedate": None, "type": "plain", "order": 999}
+        {"id": 55, "title": "Feuerwehr Onza", "description": "Helme", "duedate": None, "type": "plain", "order": 999, "owner": "jonny"}
     ]},
     {"id": 2, "title": "In Arbeit", "cards": []},
     {"id": 3, "title": "Erledigt", "cards": []},
@@ -407,6 +407,7 @@ async def test_update_order_merges_description_and_keeps_other_fields():
     assert body["title"] == "Feuerwehr Onza"
     assert body["description"] == "20x Handschuhe Groesse L"
     assert "duedate" not in body
+    assert body["owner"] == "jonny"
 
 
 @pytest.mark.asyncio
@@ -426,7 +427,7 @@ async def test_update_order_localizes_new_due_date():
 async def test_update_order_keeps_existing_due_date_when_not_given():
     stacks_with_due_date = [
         {"id": 1, "title": "Offen", "cards": [
-            {"id": 55, "title": "A", "description": "B", "duedate": "2026-09-20T00:00:00+02:00", "type": "plain", "order": 999}
+            {"id": 55, "title": "A", "description": "B", "duedate": "2026-09-20T00:00:00+02:00", "type": "plain", "order": 999, "owner": "someone-else"}
         ]},
         {"id": 2, "title": "In Arbeit", "cards": []},
         {"id": 3, "title": "Erledigt", "cards": []},
@@ -441,6 +442,7 @@ async def test_update_order_keeps_existing_due_date_when_not_given():
     _, _, body = put_calls[0].args
     assert body["duedate"] == "2026-09-20T00:00:00+02:00"
     assert body["title"] == "Neuer Name"
+    assert body["owner"] == "someone-else"
 
 
 @pytest.mark.asyncio