diff --git a/art/seafire/resources/handle-update.txx b/art/seafire/resources/handle-update.txx
index 7936ed6..d17c947 100644
--- a/art/seafire/resources/handle-update.txx
+++ b/art/seafire/resources/handle-update.txx
@@ -37,7 +37,7 @@ namespace art::seafire::resources
       }
 
       if (!input_representation_type::can_accept_input(*content_type)) {
-        res.send(400);
+        res.send(415);
         return;
       }