zstd 0 -> 1
attrpath: zstd
Checking auto update branch...
[version] 
[version] skipping because derivation has updateScript
[rustCrateVersion] 
[rustCrateVersion] No cargoSha256 or cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorSha256 or vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] Success
[updateScript] this derivation will be built:
  /nix/store/9zzsxbpwpb3yhk1p887731z2ms9v9x6i-packages.json.drv
building '/nix/store/9zzsxbpwpb3yhk1p887731z2ms9v9x6i-packages.json.drv'...

Going to be running update for following packages:
 - zstd-1.5.5

Press Enter key to continue...
Running update for:
 - zstd-1.5.5: UPDATING ...
 - zstd-1.5.5: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/tools/compression/zstd/default.nix b/pkgs/tools/compression/zstd/default.nix
index 4ba37c1502f6..92465b7ee4b2 100644
--- a/pkgs/tools/compression/zstd/default.nix
+++ b/pkgs/tools/compression/zstd/default.nix
@@ -21,13 +21,13 @@
 
 stdenv.mkDerivation rec {
   pname = "zstd";
-  version = "1.5.5";
+  version = "1.5.6";
 
   src = fetchFromGitHub {
     owner = "facebook";
     repo = "zstd";
     rev = "v${version}";
-    sha256 = "sha256-tHHHIsQU7vJySrVhJuMKUSq11MzkmC+Pcsj00uFJdnQ=";
+    sha256 = "sha256-qcd92hQqVBjMT3hyntjcgk29o9wGQsg5Hg7HE5C0UNc=";
   };
 
   nativeBuildInputs = [ cmake ]

An auto update branch exists with message `zstd: 1.5.5 -> 1.5.5-kernel`. New version is 1.5.6.
The auto update branch does not match or exceed the new version.
There might already be an open PR for this update:
- zstd: 1.5.5 -> 1.5.6
  URL "https://api.github.com/repos/NixOS/nixpkgs/issues/299590"