diff --git a/tests/test_saving_related.py b/tests/test_saving_related.py
index 537ddb4..26c7000 100644
--- a/tests/test_saving_related.py
+++ b/tests/test_saving_related.py
@@ -54,3 +54,10 @@ async def test_model_relationship():
             assert ws.id == 1
             assert ws.topic == "Topic 1"
             assert ws.category.name == "Foo"
+
+            ws.topic = 'Topic 2'
+            await ws.update()
+
+            assert ws.id == 1
+            assert ws.topic == "Topic 2"
+            assert ws.category.name == "Foo"