Running nixpkgs-update (https://github.com/NixOS/infra/blob/main/non-critical-infra/modules/nixpkgs-update/README.md) with UPDATE_INFO: emhash 1.1.0 -> 1.3.0 https://github.com/ktprime/emhash/releases
attrpath: emhash
Checking auto update branch...
[version] 
[version] skipping because derivation has updateScript
[rustCrateVersion] 
[rustCrateVersion] No cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] Success
[updateScript] this derivation will be built:
  /nix/store/hqwn4h9v48i47askm1znj2viq63asvq4-packages.json.drv
building '/nix/store/hqwn4h9v48i47askm1znj2viq63asvq4-packages.json.drv'...

Going to be running update for following packages:
 - emhash-1.1.0

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - emhash-1.1.0: UPDATING ...
 - emhash-1.1.0: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/by-name/em/emhash/package.nix b/pkgs/by-name/em/emhash/package.nix
index f1fdf4641f1b..2253963a2090 100644
--- a/pkgs/by-name/em/emhash/package.nix
+++ b/pkgs/by-name/em/emhash/package.nix
@@ -7,13 +7,13 @@
 }:
 stdenv.mkDerivation (finalAttrs: {
   pname = "emhash";
-  version = "1.1.0";
+  version = "1.3.0";
 
   src = fetchFromGitHub {
     owner = "ktprime";
     repo = "emhash";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-+oJIJvtphPHXPbmRquHRV9KkI61qwuGjJw3O1hpzwIw=";
+    hash = "sha256-qBKAC+bL7WkqihRqDbgScbHedUOIOEDlEhdRaY3mugo=";
   };
 
   strictDeps = true;

No auto update branch exists
There might already be an open PR for this update:
- emhash: 1.1.0 -> 1.3.0
  URL "https://api.github.com/repos/NixOS/nixpkgs/issues/583342"