Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: cudaPackages.libnvshmem 3.4.5-0 -> 3.6.5-0 https://github.com/NVIDIA/nvshmem/releases
attrpath: cudaPackages.libnvshmem
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/nqjc1c49viiwsh2zx0mrcl0p6rmqim7h-packages.json.drv
building '/nix/store/nqjc1c49viiwsh2zx0mrcl0p6rmqim7h-packages.json.drv'...

Going to be running update for following packages:
 - cuda12.9-libnvshmem-3.4.5-0

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - cuda12.9-libnvshmem-3.4.5-0: UPDATING ...
 - cuda12.9-libnvshmem-3.4.5-0: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/development/cuda-modules/packages/libnvshmem.nix b/pkgs/development/cuda-modules/packages/libnvshmem.nix
index 0f92bcee6432..8218ba208af9 100644
--- a/pkgs/development/cuda-modules/packages/libnvshmem.nix
+++ b/pkgs/development/cuda-modules/packages/libnvshmem.nix
@@ -46,13 +46,13 @@ backendStdenv.mkDerivation (finalAttrs: {
   # NOTE: Depends on the CUDA package set, so use cudaNamePrefix.
   name = "${cudaNamePrefix}-${finalAttrs.pname}-${finalAttrs.version}";
   pname = "libnvshmem";
-  version = "3.4.5-0";
+  version = "3.6.5-0";
 
   src = fetchFromGitHub {
     owner = "NVIDIA";
     repo = "nvshmem";
     tag = "v${finalAttrs.version}";
-    hash = "sha256-RHZzjDMYlL7vAVP1/UXM/Pt4bhajeWdCi3ihICeD2mc=";
+    hash = "sha256-2E3/WGbg6srT/e3ykK0qxTy1ZlJ9JGGLlergG0ITwTY=";
   };
 
   outputs = [ "out" ];

No auto update branch exists
There might already be an open PR for this update:
- cudaPackages.libnvshmem: 3.4.5-0 -> 3.6.5-0
  URL "https://api.github.com/repos/NixOS/nixpkgs/issues/503855"