diff --git a/pkgs/applications/version-management/gitlab/default.nix b/pkgs/applications/version-management/gitlab/default.nix
index c83478f05a91..8e20cc8a7944 100644
--- a/pkgs/applications/version-management/gitlab/default.nix
+++ b/pkgs/applications/version-management/gitlab/default.nix
@@ -1,5 +1,5 @@
 { stdenv, lib, fetchurl, fetchpatch, fetchFromGitLab, bundlerEnv
-, ruby, tzdata, git, nettools, nixosTests, nodejs, openssl
+, ruby_2_7, tzdata, git, nettools, nixosTests, nodejs, openssl
 , gitlabEnterprise ? false, callPackage, yarn
 , fixup_yarn_lock, replace, file, cacert, fetchYarnDeps, makeWrapper, pkg-config
 }:
@@ -17,7 +17,8 @@ let
 
   rubyEnv = bundlerEnv rec {
     name = "gitlab-env-${version}";
-    inherit ruby;
+    # GitLab doesn't support Ruby 3 https://gitlab.com/groups/gitlab-org/-/epics/5149
+    ruby = ruby_2_7;
     gemdir = ./rubyEnv;
     gemset =
       let x = import (gemdir + "/gemset.nix") src;
diff --git a/pkgs/development/interpreters/ruby/default.nix b/pkgs/development/interpreters/ruby/default.nix
index 99a77bfedc7c..702780b999b3 100644
--- a/pkgs/development/interpreters/ruby/default.nix
+++ b/pkgs/development/interpreters/ruby/default.nix
@@ -51,7 +51,7 @@ let
       , buildEnv, bundler, bundix
       , libiconv, libobjc, libunwind, Foundation
       , makeBinaryWrapper, buildRubyGem, defaultGemConfig
-      , baseRuby ? buildPackages.ruby_3_1.override {
+      , baseRuby ? buildPackages.ruby.override {
           docSupport = false;
           rubygemsSupport = false;
         }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 1314c910aa75..4a9385b3c735 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -5867,13 +5867,7 @@ with pkgs;
     enableExtraPlugins = true;
   };
 
-  asciidoctor = callPackage ../tools/typesetting/asciidoctor {
-    bundlerApp = bundlerApp.override {
-      # asciidoc supports both ruby 2 and 3,
-      # but we don't want to be stuck on it:
-      ruby = ruby_3_1;
-    };
-  };
+  asciidoctor = callPackage ../tools/typesetting/asciidoctor { };
 
   asciidoctor-with-extensions = callPackage ../tools/typesetting/asciidoctor-with-extensions { };
 
@@ -17015,8 +17009,8 @@ with pkgs;
     ruby_3_1
     ruby_3_2;
 
-  ruby = ruby_2_7;
-  rubyPackages = rubyPackages_2_7;
+  ruby = ruby_3_1;
+  rubyPackages = rubyPackages_3_1;
 
   rubyPackages_2_7 = recurseIntoAttrs ruby_2_7.gems;
   rubyPackages_3_0 = recurseIntoAttrs ruby_3_0.gems;