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/wngjijgra434vyhwf5bhwnr004lm17wq-packages.json.drv
building '/nix/store/wngjijgra434vyhwf5bhwnr004lm17wq-packages.json.drv'...

Going to be running update for following packages:
 - cddl-0.12.11

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - cddl-0.12.11: UPDATING ...
 - cddl-0.12.11: 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 3e50a9115688..5d0585b3dde7 100644
--- a/pkgs/by-name/cd/cddl/Gemfile.lock
+++ b/pkgs/by-name/cd/cddl/Gemfile.lock
@@ -2,13 +2,13 @@ GEM
   remote: https://rubygems.org/
   specs:
     abnc (0.1.1)
-    abnftt (0.2.10)
+    abnftt (0.2.11)
     base32 (0.3.4)
     base45_lite (1.0.1)
     base64 (0.2.0)
     cbor-canonical (0.1.2)
     cbor-deterministic (0.1.3)
-    cbor-diag (0.9.7)
+    cbor-diag (0.11.8)
       cbor-canonical
       cbor-deterministic
       cbor-packed
@@ -16,7 +16,7 @@ GEM
       neatjson
       treetop (~> 1)
     cbor-packed (0.2.2)
-    cddl (0.12.11)
+    cddl (0.12.14)
       abnc (~> 0.1.1)
       abnftt
       base32 (~> 0.3)
@@ -32,7 +32,7 @@ GEM
     polyglot (0.3.5)
     regexp-examples (1.5.1)
     scanf (1.0.0)
-    treetop (1.6.14)
+    treetop (1.6.18)
       polyglot (~> 0.3)
 
 PLATFORMS
@@ -43,4 +43,4 @@ DEPENDENCIES
   cddl
 
 BUNDLED WITH
-   2.6.6
+   2.7.2
diff --git a/pkgs/by-name/cd/cddl/gemset.nix b/pkgs/by-name/cd/cddl/gemset.nix
index 79a423bc148a..50548acc8fce 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 = "08k659idrl977g1anlff32g9cp3rykjvk05n4nifr8jxzdczzv0r";
+      sha256 = "0mw20w37kkj8d9zjs8wcdlniq0hhi78ra549md0mlcn242vh4a9q";
       type = "gem";
     };
-    version = "0.2.10";
+    version = "0.2.11";
   };
   base32 = {
     groups = [ "default" ];
@@ -82,10 +82,10 @@
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "1psh00k5s19yhxajskdqlxfamyf1piriyzm1nrcjlqcjl0863j8l";
+      sha256 = "1kjfyhavahayi5j358bn07885dxsmpihgww9c8qs6i9ap67lsy30";
       type = "gem";
     };
-    version = "0.9.7";
+    version = "0.11.8";
   };
   cbor-packed = {
     groups = [ "default" ];
@@ -113,10 +113,10 @@
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "1qd398qll4xjbfaim4smvm61ffkx95hbp8l8ma6ss5hk75gr13pz";
+      sha256 = "17822cs1gd89d5zcamy7p9c0xvfy7a0gpkaw46fafglqx2kk6bva";
       type = "gem";
     };
-    version = "0.12.11";
+    version = "0.12.14";
   };
   colorize = {
     groups = [ "default" ];
@@ -184,9 +184,9 @@
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "1m5fqy7vq6y7bgxmw7jmk7y6pla83m16p7lb41lbqgg53j8x2cds";
+      sha256 = "1nl3q5ai7ikaa5sjdbspfa4njbrdvf7898zkplmalln6y4r3y153";
       type = "gem";
     };
-    version = "1.6.14";
+    version = "1.6.18";
   };
 }

No auto update branch exists
Old version 0.12.11" 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
    ];
    platforms = lib.platforms.unix;
  };
}