diff --git a/pkgs/development/tools/rufo/Gemfile b/pkgs/development/tools/rufo/Gemfile
new file mode 100644
index 000000000000..5db4a68b13ca
--- /dev/null
+++ b/pkgs/development/tools/rufo/Gemfile
@@ -0,0 +1,3 @@
+source 'https://rubygems.org'
+
+gem 'rufo'
diff --git a/pkgs/development/tools/rufo/Gemfile.lock b/pkgs/development/tools/rufo/Gemfile.lock
new file mode 100644
index 000000000000..f63ff520e687
--- /dev/null
+++ b/pkgs/development/tools/rufo/Gemfile.lock
@@ -0,0 +1,13 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    rufo (0.12.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  rufo
+
+BUNDLED WITH
+   2.1.4
diff --git a/pkgs/development/tools/rufo/default.nix b/pkgs/development/tools/rufo/default.nix
new file mode 100644
index 000000000000..d64173700e77
--- /dev/null
+++ b/pkgs/development/tools/rufo/default.nix
@@ -0,0 +1,16 @@
+{ bundlerApp, bundlerUpdateScript, lib }:
+
+bundlerApp {
+  pname = "rufo";
+  gemdir = ./.;
+  exes = [ "rufo" ];
+
+  passthru.updateScript = bundlerUpdateScript "rufo";
+
+  meta = with lib; {
+    description = "Ruby formatter";
+    homepage = "https://github.com/ruby-formatter/rufo";
+    license = licenses.mit;
+    maintainers = with maintainers; [ andersk ];
+  };
+}
diff --git a/pkgs/development/tools/rufo/gemset.nix b/pkgs/development/tools/rufo/gemset.nix
new file mode 100644
index 000000000000..cd5c2c462a98
--- /dev/null
+++ b/pkgs/development/tools/rufo/gemset.nix
@@ -0,0 +1,12 @@
+{
+  rufo = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0nwasskcm0nrf7f52019x4fvxa5zckj4fcvf4cdl0qflrcwb1l9f";
+      type = "gem";
+    };
+    version = "0.12.0";
+  };
+}
\ No newline at end of file
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 9534a53d612b..884efc6bede8 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -11568,6 +11568,8 @@ in
   rr = callPackage ../development/tools/analysis/rr { };
   rr-unstable = callPackage ../development/tools/analysis/rr/unstable.nix { }; # This is a temporary attribute, please see the corresponding file for details.
 
+  rufo = callPackage ../development/tools/rufo { };
+
   samurai = callPackage ../development/tools/build-managers/samurai { };
 
   saleae-logic = callPackage ../development/tools/misc/saleae-logic { };