diff --git a/setup.py b/setup.py
index e88e5a4..95db67a 100644
--- a/setup.py
+++ b/setup.py
@@ -69,7 +69,7 @@
           ],
           'service': [
               'responder>=1,<3',
-              'typesystem==0.2.5',
+              'typesystem==0.4.1',
           ],
           'test': [
               'pytest<8',