diff --git a/pkgs/development/python-modules/pycync/default.nix b/pkgs/development/python-modules/pycync/default.nix
index 62dcf3c65b36..199e7ae69e44 100644
--- a/pkgs/development/python-modules/pycync/default.nix
+++ b/pkgs/development/python-modules/pycync/default.nix
@@ -7,18 +7,21 @@
   pytest-asyncio,
   pytest-mock,
   pytestCheckHook,
+  pythonOlder,
 }:
 
 buildPythonPackage rec {
   pname = "pycync";
-  version = "0.4.2";
+  version = "0.4.3";
   pyproject = true;
 
+  disabled = pythonOlder "3.13";
+
   src = fetchFromGitHub {
     owner = "Kinachi249";
     repo = "pycync";
     tag = "v${version}";
-    hash = "sha256-PDCS+ucfO5RRvTshGGjxir3ez7L405k5tL5svMxZMsg=";
+    hash = "sha256-UjodZbgicTiJV4T5yqWy5J4oAeZGbggVfaPMoDmL74M=";
   };
 
   build-system = [ hatchling ];