anchor.diff:  
   buildPythonPackage rec {
     pname = "arviz";
  -  version = "0.5.1";
  +  version = "0.6.1";
   
     src = fetchFromGitHub {
       owner = "arviz-devs";
       repo = "arviz";
       rev = version;
  -    sha256 = "0p600cakix24wz2ridnzy6sp3l1p2kr5s60qc7s82wpv7fw0i9ry";
  +    sha256 = "1qc4piz18hfik32gj4v65ckwv516mppq2ac0jyqs21lhqfwbgv9w";
     };
   
     propagatedBuildInputs = [
  
positive.code: { lib
  , buildPythonPackage
  , fetchFromGitHub
  , emcee
  , matplotlib
  , netcdf4
  
negative.code:   ];
  
    checkInputs = [
      bokeh
      emcee
      numba
      pytest
  