diff --git a/benchmark_encoder.py b/benchmark_encoder.py
index c46ea3f1a..c50e75fa8 100644
--- a/benchmark_encoder.py
+++ b/benchmark_encoder.py
@@ -1,7 +1,7 @@
 import time
-from typing import List, Optional
-from pydantic import BaseModel
+
 from fastapi.encoders import jsonable_encoder
+from pydantic import BaseModel
 
 
 class SubModel(BaseModel):
@@ -13,8 +13,8 @@ class MainModel(BaseModel):
     id: int
     title: str
     sub: SubModel
-    items: List[SubModel]
-    maybe: Optional[str] = None
+    items: list[SubModel]
+    maybe: str | None = None
 
 
 def run_benchmark():
diff --git a/fastapi/encoders.py b/fastapi/encoders.py
index 06de643d4..fab66b6d6 100644
--- a/fastapi/encoders.py
+++ b/fastapi/encoders.py
@@ -254,7 +254,8 @@ def jsonable_encoder(
             if not sqlalchemy_safe:
                 return obj_dict
             return {
-                k: v for k, v in obj_dict.items()
+                k: v
+                for k, v in obj_dict.items()
                 if not (isinstance(k, str) and k.startswith("_sa"))
             }
         # Fallback to recursive call for recursive exclude_none/exclude_defaults cleanup