final: prev: {
  libheif = prev.libheif.overrideAttrs {
    version = "1.21.2";
    src = prev.fetchFromGitHub {
      owner = "strukturag";
      repo = "libheif";
      rev = "v${final.libheif.version}";
      hash = "sha256-odkJ0wZSGoZ7mX9fkaNREDpMvQuQA9HKaf3so1dYrbc=";
    };
  };
}