python312Packages.brainflow 5.12.1 -> 5.13.2 https://github.com/brainflow-dev/brainflow/releases
attrpath: python312Packages.brainflow
Checking auto update branch...
[version] 
[version] generic version rewriter does not support multiple hashes
[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/3blp7s5xvmqnzq3kk02r87llq1ygfdgg-packages.json.drv
building '/nix/store/3blp7s5xvmqnzq3kk02r87llq1ygfdgg-packages.json.drv'...

Going to be running update for following packages:
 - python3.12-brainflow-5.12.1

Press Enter key to continue...
Running update for:
 - python3.12-brainflow-5.12.1: UPDATING ...
 - python3.12-brainflow-5.12.1: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/by-name/br/brainflow/package.nix b/pkgs/by-name/br/brainflow/package.nix
index 0c7f03ec4aad..33d0d27979f9 100644
--- a/pkgs/by-name/br/brainflow/package.nix
+++ b/pkgs/by-name/br/brainflow/package.nix
@@ -18,13 +18,13 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "brainflow";
-  version = "5.12.1";
+  version = "5.13.2";
 
   src = fetchFromGitHub {
     owner = "brainflow-dev";
     repo = "brainflow";
-    rev = "refs/tags/${finalAttrs.version}";
-    hash = "sha256-haQO03nkvLoXtFVe+C+yi+MwM0CFh6rLcLvU8fQ4k/w=";
+    rev = "refs/tags/${version}";
+    hash = "sha256-1SP0X1KcnVB/HQkbYBZqSmLS3LZYvylPOP4pWm7oFu4=";
   };
 
   patches = [

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