diff --git a/fastapi/encoders.py b/fastapi/encoders.py
index 59d788c89..d660d4642 100644
--- a/fastapi/encoders.py
+++ b/fastapi/encoders.py
@@ -253,7 +253,8 @@ 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"))
         }
     if dataclasses.is_dataclass(obj):
diff --git a/tests/test_encoder_performance.py b/tests/test_encoder_performance.py
index 86f5bc00c..aba3b7805 100644
--- a/tests/test_encoder_performance.py
+++ b/tests/test_encoder_performance.py
@@ -1,6 +1,5 @@
-from typing import List, Optional
-from pydantic import BaseModel
 from fastapi.encoders import jsonable_encoder
+from pydantic import BaseModel
 
 
 class SubModel(BaseModel):
@@ -12,8 +11,8 @@ class MainModel(BaseModel):
     id: int
     title: str
     sub: SubModel
-    items: List[SubModel]
-    maybe: Optional[str] = None
+    items: list[SubModel]
+    maybe: str | None = None
     _sa_instance_state: str = "should-be-removed"