anchor.diff:  
   buildPythonPackage rec {
     pname = "dash";
  -  version = "1.8.0";
  +  version = "1.9.1";
   
     src = fetchFromGitHub {
       owner = "plotly";
       repo = pname;
       rev = "v${version}";
  -    sha256 = "11skbvjlj93aw1pqx6j56h73sy9r06jwq7z5h64fd1a3d4z2gsvy";
  +    sha256 = "0lqvcq7xaw5l1mwmgfdhr9jspq8jzkxf77862k0ca4d9zglkqp4z";
     };
   
     propagatedBuildInputs = [
  
positive.code: 
    meta = with lib; {
      description = "Python framework for building analytical web applications";
      homepage = https://dash.plot.ly/;
      license = licenses.mit;
      maintainers = [ maintainers.antoinerg ];
    };
  
negative.code:   ];
  
    checkPhase = ''
      pytest tests/unit/test_{configs,fingerprint,import,resources}.py \
        tests/unit/dash/
    '';
  
    pythonImportsCheck = [
  