diff --git a/pyproject.toml b/pyproject.toml
index 086eeeb..9e979ae 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -88,6 +88,9 @@ extend-exclude = '''
   | build
   | dist
 )/
+|
+  # generated protobuf files
+  _pb2(_grpc)?\.pyi?$
 '''
 
 [tool.isort]