diff --git a/pkgs/by-name/cd/cddlc/Gemfile b/pkgs/by-name/cd/cddlc/Gemfile
new file mode 100644
index 000000000000..3cc0760bb2fc
--- /dev/null
+++ b/pkgs/by-name/cd/cddlc/Gemfile
@@ -0,0 +1,2 @@
+source 'https://rubygems.org'
+gem 'cddlc'
diff --git a/pkgs/by-name/cd/cddlc/Gemfile.lock b/pkgs/by-name/cd/cddlc/Gemfile.lock
new file mode 100644
index 000000000000..c3555056711f
--- /dev/null
+++ b/pkgs/by-name/cd/cddlc/Gemfile.lock
@@ -0,0 +1,19 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    cddlc (0.4.2)
+      neatjson (~> 0.10)
+      treetop (~> 1)
+    neatjson (0.10.5)
+    polyglot (0.3.5)
+    treetop (1.6.14)
+      polyglot (~> 0.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  cddlc
+
+BUNDLED WITH
+   2.6.9
diff --git a/pkgs/by-name/cd/cddlc/gemset.nix b/pkgs/by-name/cd/cddlc/gemset.nix
new file mode 100644
index 000000000000..997b4c7cabcf
--- /dev/null
+++ b/pkgs/by-name/cd/cddlc/gemset.nix
@@ -0,0 +1,47 @@
+{
+  cddlc = {
+    dependencies = [
+      "neatjson"
+      "treetop"
+    ];
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "1s3fbgd5yqgji162zsmlwnva1v1r3zc1qiyv6im7karv5f08r8m3";
+      type = "gem";
+    };
+    version = "0.4.2";
+  };
+  neatjson = {
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "0wm1lq8yl6rzysh3wg6fa55w5534k6ppiz0qb7jyvdy582mk5i0s";
+      type = "gem";
+    };
+    version = "0.10.5";
+  };
+  polyglot = {
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "1bqnxwyip623d8pr29rg6m8r0hdg08fpr2yb74f46rn1wgsnxmjr";
+      type = "gem";
+    };
+    version = "0.3.5";
+  };
+  treetop = {
+    dependencies = [ "polyglot" ];
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "1m5fqy7vq6y7bgxmw7jmk7y6pla83m16p7lb41lbqgg53j8x2cds";
+      type = "gem";
+    };
+    version = "1.6.14";
+  };
+}
diff --git a/pkgs/by-name/cd/cddlc/package.nix b/pkgs/by-name/cd/cddlc/package.nix
new file mode 100644
index 000000000000..e0054ba22ad6
--- /dev/null
+++ b/pkgs/by-name/cd/cddlc/package.nix
@@ -0,0 +1,24 @@
+{
+  lib,
+  bundlerApp,
+  bundlerUpdateScript,
+}:
+
+bundlerApp {
+  pname = "cddlc";
+
+  gemdir = ./.;
+
+  exes = [ "cddlc" ];
+
+  passthru.updateScript = bundlerUpdateScript "cddlc";
+
+  meta = {
+    description = "CDDL conversion utilities";
+    homepage = "https://github.com/cabo/cddlc";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ amesgen ];
+    platforms = lib.platforms.unix;
+    mainProgram = "cddlc";
+  };
+}