anchor.diff:  
   python3Packages.buildPythonApplication rec {
     pname = "snakemake";
  -  version = "5.19.3";
  +  version = "5.28.0";
   
     propagatedBuildInputs = with python3Packages; [
       appdirs
  
positive.code:     jsonschema
      nbformat
      psutil
      pyyaml
      ratelimiter
      requests
  
negative.code: 
    src = python3Packages.fetchPypi {
      inherit pname version;
      sha256 = "2367ce91baf7f8fa7738d33aff9670ffdf5410bbac49aeb209f73b45a3425046";
    };
  
    doCheck = false; # Tests depend on Google Cloud credentials at ${HOME}/gcloud-service-key.json
  