Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: bashly 1.4.0 -> 2.0.0 https://github.com/DannyBen/bashly/releases
attrpath: bashly
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/004g4zshjgzkqm5axiq8qppv8zfpwgfp-packages.json.drv
building '/nix/store/004g4zshjgzkqm5axiq8qppv8zfpwgfp-packages.json.drv'...
structuredAttrs is enabled

Going to be running update for following packages:
 - bashly-1.4.0

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - bashly-1.4.0: UPDATING ...
 - bashly-1.4.0: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/by-name/ba/bashly/Gemfile.lock b/pkgs/by-name/ba/bashly/Gemfile.lock
index 0e41f0278333..64e7a606c221 100644
--- a/pkgs/by-name/ba/bashly/Gemfile.lock
+++ b/pkgs/by-name/ba/bashly/Gemfile.lock
@@ -1,43 +1,27 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    bashly (1.4.0)
+    bashly (2.0.0)
       colsole (~> 1.0)
-      completely (~> 0.8.0)
       gtx (~> 0.1.1)
-      listen (~> 3.9)
-      lp (~> 0.2.0)
       mister_bin (~> 0.9.0)
       requires (~> 1.1)
       tty-markdown (~> 0.7.2)
+      watchly (~> 0.2.0)
     colsole (1.0.1)
-    completely (0.8.0)
-      colsole (~> 1.0.0)
-      erb
-      mister_bin (~> 0.7)
     docopt_ng (0.7.1)
     erb (6.0.7)
-    ffi (1.17.4)
     gtx (0.1.2)
       erb (>= 4.0, < 7)
-    io-console (0.9.2)
+    io-console (0.9.4)
     kramdown (2.5.2)
       rexml (>= 3.4.4)
-    listen (3.10.0)
-      logger
-      rb-fsevent (~> 0.10, >= 0.10.3)
-      rb-inotify (~> 0.9, >= 0.9.10)
-    logger (1.7.0)
-    lp (0.2.1)
     mister_bin (0.9.0)
       colsole (~> 1.0.0)
       docopt_ng (~> 0.7.1)
       reline (~> 0.6)
     pastel (0.8.0)
       tty-color (~> 0.5)
-    rb-fsevent (0.11.2)
-    rb-inotify (0.11.1)
-      ffi (~> 1.0)
     reline (0.7.0)
       io-console (~> 0.5)
     requires (1.1.0)
@@ -59,6 +43,7 @@ GEM
     tty-screen (0.8.2)
     unicode-display_width (2.6.0)
     unicode_utils (1.4.0)
+    watchly (0.2.0)
 
 PLATFORMS
   ruby
diff --git a/pkgs/by-name/ba/bashly/gemset.nix b/pkgs/by-name/ba/bashly/gemset.nix
index 6bb84a5294c2..72ebde60c7d4 100644
--- a/pkgs/by-name/ba/bashly/gemset.nix
+++ b/pkgs/by-name/ba/bashly/gemset.nix
@@ -2,22 +2,20 @@
   bashly = {
     dependencies = [
       "colsole"
-      "completely"
       "gtx"
-      "listen"
-      "lp"
       "mister_bin"
       "requires"
       "tty-markdown"
+      "watchly"
     ];
     groups = [ "default" ];
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "1a5kqfwkknwd2j1dbdbqgyikm196ah22dfx9f34yq5xy15im19cs";
+      sha256 = "0c3l7v27x6bbzhza3bg8bkj156f7d6pifc9plg53b5rifr922y7h";
       type = "gem";
     };
-    version = "1.4.0";
+    version = "2.0.0";
   };
   colsole = {
     groups = [ "default" ];
@@ -29,21 +27,6 @@
     };
     version = "1.0.1";
   };
-  completely = {
-    dependencies = [
-      "colsole"
-      "erb"
-      "mister_bin"
-    ];
-    groups = [ "default" ];
-    platforms = [ ];
-    source = {
-      remotes = [ "https://rubygems.org" ];
-      sha256 = "0pkciknwlfkxjmdbww6nprim7wz5pzn7gwj1ga8lfpw0hifwv4z4";
-      type = "gem";
-    };
-    version = "0.8.0";
-  };
   docopt_ng = {
     groups = [ "default" ];
     platforms = [ ];
@@ -64,16 +47,6 @@
     };
     version = "6.0.7";
   };
-  ffi = {
-    groups = [ "default" ];
-    platforms = [ ];
-    source = {
-      remotes = [ "https://rubygems.org" ];
-      sha256 = "1kqasqvy8d7r09ri4n6bkdwbk63j7afd9ilsw34nzlgh0qp69ldw";
-      type = "gem";
-    };
-    version = "1.17.4";
-  };
   gtx = {
     dependencies = [ "erb" ];
     groups = [ "default" ];
@@ -90,10 +63,10 @@
     platforms = [ ];
     source = {
       remotes = [ "https://rubygems.org" ];
-      sha256 = "026v93kja19bfslnwi9xfq2dj4r89kkwdprim4whjg6h3n4lz9zg";
+      sha256 = "1cgvhm0d4awr8j42b8v1nl1jfgx45ihv8mylargfi3lj697k00x4";
       type = "gem";
     };
-    version = "0.9.2";
+    version = "0.9.4";
   };
   kramdown = {
     dependencies = [ "rexml" ];
@@ -106,41 +79,6 @@
     };
     version = "2.5.2";
   };
-  listen = {
-    dependencies = [
-      "logger"
-      "rb-fsevent"
-      "rb-inotify"
-    ];
-    groups = [ "default" ];
-    platforms = [ ];
-    source = {
-      remotes = [ "https://rubygems.org" ];
-      sha256 = "1ln9c0vx165hkfbn2817qw4m6i77xcxh6q0r5v6fqfhlcbdq5qf6";
-      type = "gem";
-    };
-    version = "3.10.0";
-  };
-  logger = {
-    groups = [ "default" ];
-    platforms = [ ];
-    source = {
-      remotes = [ "https://rubygems.org" ];
-      sha256 = "00q2zznygpbls8asz5knjvvj2brr3ghmqxgr83xnrdj4rk3xwvhr";
-      type = "gem";
-    };
-    version = "1.7.0";
-  };
-  lp = {
-    groups = [ "default" ];
-    platforms = [ ];
-    source = {
-      remotes = [ "https://rubygems.org" ];
-      sha256 = "0ns1aza32n929w7smg1dsn4g6qlfi7k1jrvssyn35cicmwn0gyyr";
-      type = "gem";
-    };
-    version = "0.2.1";
-  };
   mister_bin = {
     dependencies = [
       "colsole"
@@ -167,27 +105,6 @@
     };
     version = "0.8.0";
   };
-  rb-fsevent = {
-    groups = [ "default" ];
-    platforms = [ ];
-    source = {
-      remotes = [ "https://rubygems.org" ];
-      sha256 = "1zmf31rnpm8553lqwibvv3kkx0v7majm1f341xbxc0bk5sbhp423";
-      type = "gem";
-    };
-    version = "0.11.2";
-  };
-  rb-inotify = {
-    dependencies = [ "ffi" ];
-    groups = [ "default" ];
-    platforms = [ ];
-    source = {
-      remotes = [ "https://rubygems.org" ];
-      sha256 = "0vmy8xgahixcz6hzwy4zdcyn2y6d6ri8dqv5xccgzc1r292019x0";
-      type = "gem";
-    };
-    version = "0.11.1";
-  };
   reline = {
     dependencies = [ "io-console" ];
     groups = [ "default" ];
@@ -312,4 +229,14 @@
     };
     version = "1.4.0";
   };
+  watchly = {
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "0ryhm2m0waw02k5fg4cc3xs06m5xnl436a9g2qjk6w4api4x97gb";
+      type = "gem";
+    };
+    version = "0.2.0";
+  };
 }

No auto update branch exists
Old version 1.4.0" not present in master derivation file with contents: {
  lib,
  bundlerApp,
  bundlerUpdateScript,
}:

bundlerApp {
  pname = "bashly";

  gemdir = ./.;
  exes = [ "bashly" ];

  passthru.updateScript = bundlerUpdateScript "bashly";

  meta = {
    description = "Bash command line framework and CLI generator";
    homepage = "https://github.com/DannyBen/bashly";
    license = lib.licenses.mit;
    mainProgram = "bashly";
    maintainers = [ ];
    platforms = lib.platforms.unix;
  };
}