Running nixpkgs-update (https://github.com/NixOS/infra/blob/main/non-critical-infra/modules/nixpkgs-update/README.md) with UPDATE_INFO: b4 0 -> 1
attrpath: b4
Checking auto update branch...
[version] 
[version] generic version rewriter does not support multiple hashes
[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/cz8izm7hcjzbva4ajk9pjp7wvr2fa7fx-packages.json.drv
building '/nix/store/cz8izm7hcjzbva4ajk9pjp7wvr2fa7fx-packages.json.drv'...

Going to be running update for following packages:
 - b4-0.15.2

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - b4-0.15.2: UPDATING ...
 - b4-0.15.2: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/by-name/b4/b4/package.nix b/pkgs/by-name/b4/b4/package.nix
index 74d0441c3786..db049591abda 100644
--- a/pkgs/by-name/b4/b4/package.nix
+++ b/pkgs/by-name/b4/b4/package.nix
@@ -8,12 +8,12 @@
 
 python3Packages.buildPythonApplication (finalAttrs: {
   pname = "b4";
-  version = "0.15.2";
+  version = "0.16.0";
   pyproject = true;
 
   src = fetchPypi {
     inherit (finalAttrs) pname version;
-    hash = "sha256-uBXyrtIohxjP4qFMdkIaALxPCRjqMrRd0WRcmZ/dpp0=";
+    hash = "sha256-BxgjoekEUIpv2ar4zC+akml+HfonAAC00RMAFbVvQTc=";
   };
 
   # tests make dns requests and fails

No auto update branch exists
There might already be an open PR for this update:
- b4: 0.15.2 -> 0.16.0
  URL "https://api.github.com/repos/NixOS/nixpkgs/issues/580432"