Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: cddl 0 -> 1
attrpath: cddl
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/wai1vidr0clh267irq572ahvcwl8wap2-packages.json.drv
building '/nix/store/wai1vidr0clh267irq572ahvcwl8wap2-packages.json.drv'...

Going to be running update for following packages:
 - cddl-0.12.9

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - cddl-0.12.9: UPDATING ...
 - cddl-0.12.9: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/by-name/cd/cddl/Gemfile.lock b/pkgs/by-name/cd/cddl/Gemfile.lock
index 660d6aaf3955..b41cbde197e5 100644
--- a/pkgs/by-name/cd/cddl/Gemfile.lock
+++ b/pkgs/by-name/cd/cddl/Gemfile.lock
@@ -2,20 +2,20 @@ GEM
   remote: https://rubygems.org/
   specs:
     abnc (0.1.1)
-    abnftt (0.2.6)
+    abnftt (0.2.10)
     base32 (0.3.4)
     base45_lite (1.0.1)
     cbor-canonical (0.1.2)
     cbor-deterministic (0.1.3)
-    cbor-diag (0.9.5)
+    cbor-diag (0.10.3)
       cbor-canonical
       cbor-deterministic
       cbor-packed
       json_pure
       neatjson
       treetop (~> 1)
-    cbor-packed (0.1.5)
-    cddl (0.12.9)
+    cbor-packed (0.2.2)
+    cddl (0.12.12)
       abnc (~> 0.1.1)
       abnftt
       base32 (~> 0.3)
@@ -31,7 +31,7 @@ GEM
     polyglot (0.3.5)
     regexp-examples (1.5.1)
     scanf (1.0.0)
-    treetop (1.6.12)
+    treetop (1.6.18)
       polyglot (~> 0.3)
 
 PLATFORMS
@@ -41,4 +41,4 @@ DEPENDENCIES
   cddl
 
 BUNDLED WITH
-   2.5.22
+   2.7.2
diff --git a/pkgs/by-name/cd/cddl/gemset.nix b/pkgs/by-name/cd/cddl/gemset.nix
index 5fbac5e7868f..d53ec1fa5680 100644
--- a/pkgs/by-name/cd/cddl/gemset.nix
+++ b/pkgs/by-name/cd/cddl/gemset.nix
@@ -14,10 +14,10 @@
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "1r9ay1kxn2yh9h0j2hr7iszz7cprpc7s6yjsv2k4inxndbsw5y4v";
+      sha256 = "08k659idrl977g1anlff32g9cp3rykjvk05n4nifr8jxzdczzv0r";
       type = "gem";
     };
-    version = "0.2.6";
+    version = "0.2.10";
   };
   base32 = {
     groups = [ "default" ];
@@ -72,20 +72,20 @@
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "1gxfs63jgvhdkfpm97mxpz14gxsvqds5pza8i175bmsqwvx3zn87";
+      sha256 = "0jvwzzwip5v3bgcn1i5mfqfy8fsqhdcmnfckran4yknzn2gq618h";
       type = "gem";
     };
-    version = "0.9.5";
+    version = "0.10.3";
   };
   cbor-packed = {
     groups = [ "default" ];
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "1dijyj7rivi39h34f32fx7k4xvngldf569i0372n1z6w01nv761l";
+      sha256 = "0sbbz0p17m77xqmh4fv4rwly1cj799hapdsg4h43kwsw8h0rnk8n";
       type = "gem";
     };
-    version = "0.1.5";
+    version = "0.2.2";
   };
   cddl = {
     dependencies = [
@@ -103,10 +103,10 @@
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "1811vvf73jjcxifq8h2cyp0b2z2qwhkplmrc2javx7gwrxlgb2p4";
+      sha256 = "01p4r70d5zm0y4kjws9880diibdvsm88zrf5il7zyvb0mrb9ndyw";
       type = "gem";
     };
-    version = "0.12.9";
+    version = "0.12.12";
   };
   colorize = {
     groups = [ "default" ];
@@ -174,9 +174,9 @@
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "0adc8qblz8ii668r3rksjx83p675iryh52rvdvysimx2hkbasj7d";
+      sha256 = "1nl3q5ai7ikaa5sjdbspfa4njbrdvf7898zkplmalln6y4r3y153";
       type = "gem";
     };
-    version = "1.6.12";
+    version = "1.6.18";
   };
 }

No auto update branch exists
Old version 0.12.9" not present in master derivation file with contents: {
  lib,
  bundlerApp,
  bundlerUpdateScript,
  makeBinaryWrapper,
}:

bundlerApp {
  pname = "cddl";

  gemfile = ./Gemfile;
  lockfile = ./Gemfile.lock;

  gemset = lib.recursiveUpdate (import ./gemset.nix) {
    "cddl" = {
      dontBuild = false;
      # setting env vars is not supported by patchShebangs
      postPatch = ''
        sed -i 's\#!/usr/bin/env RUBY_THREAD_VM_STACK_SIZE=5000000\#!/usr/bin/env\' bin/cddl
      '';
    };
  };

  exes = [ "cddl" ];

  nativeBuildInputs = [ makeBinaryWrapper ];

  postBuild = ''
    wrapProgram $out/bin/cddl \
      --set RUBY_THREAD_VM_STACK_SIZE 5000000
  '';

  passthru.updateScript = bundlerUpdateScript "cddl";

  meta = {
    description = "Parser, generator, and validator for CDDL";
    homepage = "https://rubygems.org/gems/cddl";
    license = with lib.licenses; mit;
    maintainers = with lib.maintainers; [
      fdns
      nicknovitski
      amesgen
    ];
    platforms = lib.platforms.unix;
  };
}