diff --git a/sonora/asgi.py b/sonora/asgi.py
index c18a06b..93012cc 100644
--- a/sonora/asgi.py
+++ b/sonora/asgi.py
@@ -191,7 +191,7 @@ async def _do_unary_response(
         self, rpc_method, receive, send, wrap_message, context, coroutine
     ):
         headers = context._response_headers
-        
+
         if coroutine is None:
             message = None
         else:
diff --git a/sonora/client.py b/sonora/client.py
index 375ac79..fc0b52c 100644
--- a/sonora/client.py
+++ b/sonora/client.py
@@ -54,7 +54,10 @@ def __init__(self, session, url, path, request_serializer, request_deserializer)
         self._path = path
         self._rpc_url = urljoin(url, path)
 
-        self._metadata = [("x-user-agent", "grpc-web-python/0.1"), ('content-type', 'application/grpc-web+proto')]
+        self._metadata = [
+            ("x-user-agent", "grpc-web-python/0.1"),
+            ("content-type", "application/grpc-web+proto"),
+        ]
 
         self._serializer = request_serializer
         self._deserializer = request_deserializer
diff --git a/tests/conftest.py b/tests/conftest.py
index dca1459..2f29874 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -117,7 +117,7 @@ async def HelloMetadata(self, request, context):
             for key, value in context.invocation_metadata()
         )
 
-        await context.set_trailing_metadata(
+        context.set_trailing_metadata(
             (f"trailing-{key}", repr(value))
             for key, value in context.invocation_metadata()
         )
@@ -139,7 +139,7 @@ async def HelloStreamMetadata(self, request, context):
         for c in value:
             yield helloworld_pb2.HelloReply(message=c)
 
-        await context.set_trailing_metadata(
+        context.set_trailing_metadata(
             (f"trailing-{key}", repr(value))
             for key, value in context.invocation_metadata()
         )