diff --git a/pkgs/development/python-modules/aiohttp/default.nix b/pkgs/development/python-modules/aiohttp/default.nix
index b9f1f9e1c72a..bf6a0326ff4e 100644
--- a/pkgs/development/python-modules/aiohttp/default.nix
+++ b/pkgs/development/python-modules/aiohttp/default.nix
@@ -3,6 +3,7 @@
   stdenv,
   buildPythonPackage,
   fetchFromGitHub,
+  fetchpatch2,
   substituteAll,
   isPy310,
   isPyPy,
@@ -45,14 +46,14 @@
 
 buildPythonPackage rec {
   pname = "aiohttp";
-  version = "3.11.11";
+  version = "3.11.12";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "aio-libs";
     repo = "aiohttp";
     tag = "v${version}";
-    hash = "sha256-a4h8oFJxo1TSuhIjdUC0wqJSsepmzq6vjn5mwjw4bIw=";
+    hash = "sha256-GveluMxw100ZllDF+MT4QkZVD9q7UWHwF7IBK85J/j0=";
   };
 
   patches = [
@@ -61,6 +62,12 @@ buildPythonPackage rec {
       llhttpDev = lib.getDev llhttp;
       llhttpLib = lib.getLib llhttp;
     })
+    (fetchpatch2 {
+      # https://github.com/aio-libs/aiohttp/issues/10421
+      # https://github.com/aio-libs/aiohttp/pull/10423
+      url = "https://github.com/aio-libs/aiohttp/commit/51daf7190e7674773c22011a4e443df8b5e66437.patch";
+      hash = "sha256-fADetk2tqg92J2sSgzKVTEhbQRSYl6430dxdVZuFx5I=";
+    })
   ];
 
   postPatch = ''