diff --git a/pkgs/development/python-modules/charset-normalizer/default.nix b/pkgs/development/python-modules/charset-normalizer/default.nix
index 1db84cffa0dd..4d5877b8b5bf 100644
--- a/pkgs/development/python-modules/charset-normalizer/default.nix
+++ b/pkgs/development/python-modules/charset-normalizer/default.nix
@@ -13,23 +13,18 @@
   withMypyc ? !isPyPy && !stdenv.hostPlatform.isStatic,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "charset-normalizer";
-  version = "3.4.9";
+  version = "3.5.1";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "jawah";
     repo = "charset_normalizer";
-    tag = version;
-    hash = "sha256-YOskF90ach/qEwnMeYDEEO2H4DOoz/LZApXDRU9mvnM=";
+    tag = finalAttrs.version;
+    hash = "sha256-zIN1y9HVwaCqixjRFLn6g/tz95E41m7t7j4eY5jNZMs=";
   };
 
-  postPatch = ''
-    substituteInPlace _mypyc_hook/backend.py \
-      --replace-fail "mypy>=1.4.1,<2.2" "mypy"
-  '';
-
   build-system = [
     setuptools
   ]
@@ -50,10 +45,10 @@ buildPythonPackage rec {
 
   meta = {
     description = "Python module for encoding and language detection";
-    mainProgram = "normalizer";
     homepage = "https://charset-normalizer.readthedocs.io/";
-    changelog = "https://github.com/jawah/charset_normalizer/blob/${src.tag}/CHANGELOG.md";
+    changelog = "https://github.com/jawah/charset_normalizer/blob/${finalAttrs.src.tag}/CHANGELOG.md";
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ fab ];
+    mainProgram = "normalizer";
   };
-}
+})