diff --git a/pkgs/development/python-modules/asyncstdlib/default.nix b/pkgs/development/python-modules/asyncstdlib/default.nix
index c31beceb1496..d44de866d323 100644
--- a/pkgs/development/python-modules/asyncstdlib/default.nix
+++ b/pkgs/development/python-modules/asyncstdlib/default.nix
@@ -1,14 +1,15 @@
-{ lib
-, buildPythonPackage
-, fetchFromGitHub
-, flit-core
-, pytestCheckHook
-, pythonOlder
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  flit-core,
+  pytestCheckHook,
+  pythonOlder,
 }:
 
 buildPythonPackage rec {
   pname = "asyncstdlib";
-  version = "3.12.2";
+  version = "3.12.3";
   pyproject = true;
 
   disabled = pythonOlder "3.9";
@@ -17,20 +18,14 @@ buildPythonPackage rec {
     owner = "maxfischer2781";
     repo = "asyncstdlib";
     rev = "refs/tags/v${version}";
-    hash = "sha256-5DQM8m3aeCZAXOi+Rm+iM409juBBYdZDNqBAbhyTm/M=";
+    hash = "sha256-OLb4+7FFeVDW0ePyVJW8aaosouxlU/4Uq2ktvVLpDFY=";
   };
 
-  build-system = [
-    flit-core
-  ];
+  build-system = [ flit-core ];
 
-  nativeCheckInputs = [
-    pytestCheckHook
-  ];
+  nativeCheckInputs = [ pytestCheckHook ];
 
-  pythonImportsCheck = [
-    "asyncstdlib"
-  ];
+  pythonImportsCheck = [ "asyncstdlib" ];
 
   meta = with lib; {
     description = "Python library that extends the Python asyncio standard library";