Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: fontconfig 0 -> 1
attrpath: fontconfig
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/h9yy1yl5pvz5a2rjxj6xlyr3k4npmxf6-packages.json.drv
building '/nix/store/h9yy1yl5pvz5a2rjxj6xlyr3k4npmxf6-packages.json.drv'...

Going to be running update for following packages:
 - fontconfig-2.18.2

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - fontconfig-2.18.2: UPDATING ...
 - fontconfig-2.18.2: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/development/libraries/fontconfig/default.nix b/pkgs/development/libraries/fontconfig/default.nix
index ef66147699a4..cfd8168ca842 100644
--- a/pkgs/development/libraries/fontconfig/default.nix
+++ b/pkgs/development/libraries/fontconfig/default.nix
@@ -17,7 +17,7 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "fontconfig";
-  version = "2.18.2";
+  version = "2.18.3";
 
   outputs = [
     "bin"
@@ -30,7 +30,7 @@ stdenv.mkDerivation (finalAttrs: {
   # ref: https://github.com/NixOS/nixpkgs/pull/401037#discussion_r2055430206
   src = fetchurl {
     url = "https://gitlab.freedesktop.org/api/v4/projects/890/packages/generic/fontconfig/${finalAttrs.version}/fontconfig-${finalAttrs.version}.tar.xz";
-    hash = "sha256-z45ldu8EhMFQeb2vd82cUcRk31NlgUraTT7nMx6jHrU=";
+    hash = "sha256-T3tVSjjN94wDP2ZsiHHzdJ4UoJT2Wgf2MMke0LQ9NeM=";
   };
 
   nativeBuildInputs = [

An auto update branch exists with message `fontconfig: 2.18.2 -> 2.18.3`. New version is 2.18.3.
An auto update branch exists with an equal or greater version