gtkmm3 0 -> 1
attrpath: gtkmm3
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/w6lkzw6gq3wl6jvrrzifylrn7pwfrqgj-packages.json.drv
building '/nix/store/w6lkzw6gq3wl6jvrrzifylrn7pwfrqgj-packages.json.drv'...

Going to be running update for following packages:
 - gtkmm-3.24.8

Press Enter key to continue...
Running update for:
 - gtkmm-3.24.8: UPDATING ...
 - gtkmm-3.24.8: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/development/libraries/gtkmm/3.x.nix b/pkgs/development/libraries/gtkmm/3.x.nix
index 1d3f15ba9871..c09f05b43772 100644
--- a/pkgs/development/libraries/gtkmm/3.x.nix
+++ b/pkgs/development/libraries/gtkmm/3.x.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "gtkmm";
-  version = "3.24.8";
+  version = "3.24.9";
 
   src = fetchurl {
     url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
-    sha256 = "0pQMZJIuW5WFVLI9TEHRg56p5D4NLls4Gc+0aCSgmMQ=";
+    sha256 = "MNW/5ARXHOVmqOk4yLrBdXZCDrUI8eJXg32mPxStRM4=";
   };
 
   outputs = [ "out" "dev" ];

No auto update branch exists
Successfully finished processing
cachix "/nix/store/cifb1g4017fjinf396x8m2xp2z1576bq-gtkmm-3.24.9"
[check][nixpkgs-review]