anchor.diff:  
   buildPythonPackage rec {
     pname = "yalesmartalarmclient";
  -  version = "0.3.1";
  +  version = "0.3.4";
   
     src = fetchFromGitHub {
       owner = "domwillcode";
       repo = "yale-smart-alarm-client";
       rev = "v${version}";
  -    sha256 = "0fscp9n66h8a8khvjs2rjgm95xsdckpknadnyxqdmhw3hlj0aw6h";
  +    sha256 = "sha256-waWi3QnH7xQZh5iYklISCvfAaBdH5k+Y10huZuTNlSc=";
     };
   
  -  propagatedBuildInputs = [ requests ];
  +  propagatedBuildInputs = [
  +    backoff
  +    requests
  +  ];
   
     # Project has no tests
     doCheck = false;
  
positive.code: 
    meta = with lib; {
      description = "Python module to interface with Yale Smart Alarm Systems";
      homepage = "https://github.com/mampfes/python-wiffi";
      license = with licenses; [ asl20 ];
      maintainers = with maintainers; [ fab ];
    };
  
negative.code: { lib
  , backoff
  , buildPythonPackage
  , fetchFromGitHub
  , requests
  