anchor.diff:  
   buildPythonPackage rec {
     pname = "zigpy";
  -  version = "0.49.1";
  +  version = "0.50.2";
     format = "setuptools";
   
     disabled = pythonOlder "3.7";
  
positive.code:     owner = "zigpy";
      repo = "zigpy";
      rev = "refs/tags/${version}";
      sha256 = "sha256-ai0qWKgsh8kIS4juvzpE+amsnIbEOJbhGutV75yRGog=";
    };
  
    propagatedBuildInputs = [
  
negative.code: , buildPythonPackage
  , crccheck
  , cryptography
  , freezegun
  , fetchFromGitHub
  , pycryptodome
  , pytest-aiohttp
  