anchor.diff:  { stdenv, fetchurl, fetchFromGitHub, buildGoPackage, buildEnv }:
   
   let
  -  version = "5.15.0";
  +  version = "5.25.0";
   
     mattermost-server = buildGoPackage rec {
       pname = "mattermost-server";
  
positive.code:       owner = "mattermost";
        repo = "mattermost-server";
        rev = "v${version}";
        sha256 = "1bh53h0bmpc1qmnbpsmwkfrvj66z18m7b1xg7pqikid57ssqxjx9";
      };
  
      goPackagePath = "github.com/mattermost/mattermost-server";
  
negative.code: 
      src = fetchurl {
        url = "https://releases.mattermost.com/${version}/mattermost-${version}-linux-amd64.tar.gz";
        sha256 = "08sp4idms7qyafk59plfzk380r72bphqa3ka648v25wh5h3293pn";
      };
  
      installPhase = ''
  