diff --git a/pkgs/development/ruby-modules/with-packages/Gemfile b/pkgs/development/ruby-modules/with-packages/Gemfile
index 15beee6b0113..3859205251ed 100644
--- a/pkgs/development/ruby-modules/with-packages/Gemfile
+++ b/pkgs/development/ruby-modules/with-packages/Gemfile
@@ -146,6 +146,7 @@ gem 'redis'
 gem 'redis-rack'
 gem 'rest-client'
 gem 'rmagick'
+gem 'rmate'
 gem 'rpam2'
 gem 'rspec'
 gem 'rubocop'
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 16a555a6950d..235eee08a479 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -3678,6 +3678,8 @@ with pkgs;
 
   reuse = with python3.pkgs; toPythonApplication reuse;
 
+  rmate = rubyPackages.rmate;
+
   rmlint = callPackage ../tools/misc/rmlint {
     inherit (python3Packages) sphinx;
   };
diff --git a/pkgs/top-level/ruby-packages.nix b/pkgs/top-level/ruby-packages.nix
index ab8da86f2c5c..8e31a3046942 100644
--- a/pkgs/top-level/ruby-packages.nix
+++ b/pkgs/top-level/ruby-packages.nix
@@ -3961,6 +3961,16 @@
     };
     version = "6.1.4";
   };
+  rmate = {
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "01qyw345yg3n9z3xm98p9hqmgqri6yfhdd6d2kfqkg3ha8mi3xh5";
+      type = "gem";
+    };
+    version = "1.5.9";
+  };
   rouge = {
     groups = [ "default" ];
     platforms = [ ];