From da0162b95ca3a9a348a8a300307255247ed42636 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebasti=C3=A1n=20Ram=C3=ADrez?= <tiangolo@gmail.com>
Date: Wed, 19 Nov 2025 17:21:05 +0100
Subject: [PATCH] =?UTF-8?q?=E2=99=BB=EF=B8=8F=20Make=20the=20result=20of?=
 =?UTF-8?q?=20`Depends`=20and=20`Security`=20hashable?=
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---
 fastapi/dependencies/utils.py | 3 ++-
 fastapi/params.py             | 4 ++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/fastapi/dependencies/utils.py b/fastapi/dependencies/utils.py
index 4b69e39a1..1e92c1ba2 100644
--- a/fastapi/dependencies/utils.py
+++ b/fastapi/dependencies/utils.py
@@ -1,3 +1,4 @@
+import dataclasses
 import inspect
 from contextlib import AsyncExitStack, contextmanager
 from copy import copy, deepcopy
@@ -428,7 +429,7 @@ def analyze_param(
     if depends is not None and depends.dependency is None:
         # Copy `depends` before mutating it
         depends = copy(depends)
-        depends.dependency = type_annotation
+        depends = dataclasses.replace(depends, dependency=type_annotation)
 
     # Handle non-param type annotations like Request
     if lenient_issubclass(
diff --git a/fastapi/params.py b/fastapi/params.py
index 6a58d5808..6d07df35e 100644
--- a/fastapi/params.py
+++ b/fastapi/params.py
@@ -762,13 +762,13 @@ class File(Form):  # type: ignore[misc]
         )
 
 
-@dataclass
+@dataclass(frozen=True)
 class Depends:
     dependency: Optional[Callable[..., Any]] = None
     use_cache: bool = True
     scope: Union[Literal["function", "request"], None] = None
 
 
-@dataclass
+@dataclass(frozen=True)
 class Security(Depends):
     scopes: Optional[Sequence[str]] = None