diff --git a/Claude outputs/main.py b/Claude outputs/main.py
index 5e9669d..e293df6 100644
--- a/Claude outputs/main.py	
+++ b/Claude outputs/main.py	
@@ -556,6 +556,29 @@ async def list_orders(status: str = None) -> list:
     return orders
 
 
+async def update_order_status(order_id: int, status: str) -> dict:
+    board = await _ensure_deck_board()
+    if status not in board["stacks"]:
+        raise ValueError(f"Unknown status: {status}")
+    target_stack_id = board["stacks"][status]
+
+    stacks = await _deck_request("GET", f"/boards/{board['board_id']}/stacks")
+    current_stack_id = None
+    for stack in stacks:
+        if any(c["id"] == order_id for c in stack.get("cards", [])):
+            current_stack_id = stack["id"]
+            break
+    if current_stack_id is None:
+        raise ValueError(f"Order {order_id} not found")
+
+    await _deck_request(
+        "PUT",
+        f"/boards/{board['board_id']}/stacks/{current_stack_id}/cards/{order_id}/reorder",
+        {"stackId": target_stack_id, "order": 999},
+    )
+    return {"id": order_id, "status": status}
+
+
 def _decode_mime_words(value: str) -> str:
     parts = decode_header(value)
     decoded = []
diff --git a/Claude outputs/tests/test_orders.py b/Claude outputs/tests/test_orders.py
index 73fef13..0bd9bef 100644
--- a/Claude outputs/tests/test_orders.py	
+++ b/Claude outputs/tests/test_orders.py	
@@ -215,3 +215,51 @@ async def test_list_orders_filters_by_status():
         orders = await main.list_orders(status="Erledigt")
 
     assert [o["id"] for o in orders] == [56]
+
+
+@pytest.mark.asyncio
+async def test_update_order_status_finds_current_stack_and_reorders():
+    stacks_response = [
+        {"id": 1, "title": "Offen", "cards": [{"id": 55, "title": "A"}]},
+        {"id": 2, "title": "In Arbeit", "cards": []},
+        {"id": 3, "title": "Erledigt", "cards": []},
+    ]
+
+    async def fake_deck_request(method, path, json_body=None):
+        if (method, path) == ("GET", "/boards/10/stacks"):
+            return stacks_response
+        if method == "PUT":
+            return {"id": 55}
+        raise AssertionError(f"unexpected call {method} {path}")
+
+    with patch.object(main, "_ensure_deck_board", new=AsyncMock(return_value=_BOARD)), patch.object(
+        main, "_deck_request", new=AsyncMock(side_effect=fake_deck_request)
+    ) as mock_req:
+        result = await main.update_order_status(55, "In Arbeit")
+
+    assert result == {"id": 55, "status": "In Arbeit"}
+    put_call = [c for c in mock_req.call_args_list if c.args[0] == "PUT"][0]
+    _, path, body = put_call.args
+    assert path == "/boards/10/stacks/1/cards/55/reorder"
+    assert body == {"stackId": 2, "order": 999}
+
+
+@pytest.mark.asyncio
+async def test_update_order_status_raises_for_unknown_status():
+    with patch.object(main, "_ensure_deck_board", new=AsyncMock(return_value=_BOARD)):
+        with pytest.raises(ValueError):
+            await main.update_order_status(55, "Storniert")
+
+
+@pytest.mark.asyncio
+async def test_update_order_status_raises_when_card_not_found():
+    stacks_response = [
+        {"id": 1, "title": "Offen", "cards": []},
+        {"id": 2, "title": "In Arbeit", "cards": []},
+        {"id": 3, "title": "Erledigt", "cards": []},
+    ]
+    with patch.object(main, "_ensure_deck_board", new=AsyncMock(return_value=_BOARD)), patch.object(
+        main, "_deck_request", new=AsyncMock(return_value=stacks_response)
+    ):
+        with pytest.raises(ValueError):
+            await main.update_order_status(999, "Erledigt")