python312Packages.simpleitk 2.3.1 -> 2.4.0 https://github.com/SimpleITK/SimpleITK/releases
attrpath: python312Packages.simpleitk
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/8dq947ar70dlhmjh0km94jwk3q1x9rxk-packages.json.drv
building '/nix/store/8dq947ar70dlhmjh0km94jwk3q1x9rxk-packages.json.drv'...

Going to be running update for following packages:
 - python3.12-simpleitk-2.3.1

Press Enter key to continue...
Running update for:
 - python3.12-simpleitk-2.3.1: UPDATING ...
 - python3.12-simpleitk-2.3.1: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/development/libraries/simpleitk/default.nix b/pkgs/development/libraries/simpleitk/default.nix
index 10e055d5acde..cc8c4e4d35a1 100644
--- a/pkgs/development/libraries/simpleitk/default.nix
+++ b/pkgs/development/libraries/simpleitk/default.nix
@@ -10,13 +10,13 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "simpleitk";
-  version = "2.3.1";
+  version = "2.4.0";
 
   src = fetchFromGitHub {
     owner = "SimpleITK";
     repo = "SimpleITK";
-    rev = "refs/tags/v${finalAttrs.version}";
-    hash = "sha256-JmZUlIdcCQ9yEqxoUwRaxvr/Q7xZm41QA3mtDtoSdyI=";
+    rev = "refs/tags/v${version}";
+    hash = "sha256-/FV5NAM9DJ54Vg6/5yn9DCybry+a8lS3fQ3HWLOeOTA=";
   };
 
   nativeBuildInputs = [

The derivation has no 'version' attribute, so do not know how to figure out the version while doing an updateScript update