diff --git a/nixos/modules/services/misc/redmine.nix b/nixos/modules/services/misc/redmine.nix
index bf9a6914a483..8bd687d08385 100644
--- a/nixos/modules/services/misc/redmine.nix
+++ b/nixos/modules/services/misc/redmine.nix
@@ -66,7 +66,7 @@ in
         type = types.package;
         default = pkgs.redmine;
         description = "Which Redmine package to use.";
-        example = "pkgs.redmine.override { ruby = pkgs.ruby_2_4; }";
+        example = "pkgs.redmine.override { ruby = pkgs.ruby_2_7; }";
       };
 
       user = mkOption {
diff --git a/pkgs/development/ruby-modules/with-packages/test.nix b/pkgs/development/ruby-modules/with-packages/test.nix
index 73f8f02b27b3..dc1da3de4924 100644
--- a/pkgs/development/ruby-modules/with-packages/test.nix
+++ b/pkgs/development/ruby-modules/with-packages/test.nix
@@ -9,6 +9,7 @@ let
     ruby_2_4
     ruby_2_5
     ruby_2_6
+    ruby_2_7
   ];
 
   gemTests =
diff --git a/pkgs/servers/http/unit/default.nix b/pkgs/servers/http/unit/default.nix
index 8711be4b5c00..71ccbb2c15a3 100644
--- a/pkgs/servers/http/unit/default.nix
+++ b/pkgs/servers/http/unit/default.nix
@@ -9,6 +9,7 @@
 , withRuby_2_4 ? false, ruby_2_4
 , withRuby_2_5 ? false, ruby_2_5
 , withRuby_2_6 ? true, ruby_2_6
+, withRuby_2_7 ? true, ruby_2_7
 , withSSL ? true, openssl ? null
 , withIPv6 ? true
 , withDebug ? false
@@ -40,6 +41,7 @@ stdenv.mkDerivation rec {
     ++ optional withRuby_2_4 ruby_2_4
     ++ optional withRuby_2_5 ruby_2_5
     ++ optional withRuby_2_6 ruby_2_6
+    ++ optional withRuby_2_7 ruby_2_7
     ++ optional withSSL openssl;
 
   configureFlags = [
@@ -62,6 +64,7 @@ stdenv.mkDerivation rec {
     ${optionalString withRuby_2_4   "./configure ruby   --module=ruby24   --ruby=${ruby_2_4}/bin/ruby"}
     ${optionalString withRuby_2_5   "./configure ruby   --module=ruby25   --ruby=${ruby_2_5}/bin/ruby"}
     ${optionalString withRuby_2_6   "./configure ruby   --module=ruby26   --ruby=${ruby_2_6}/bin/ruby"}
+    ${optionalString withRuby_2_7   "./configure ruby   --module=ruby27   --ruby=${ruby_2_7}/bin/ruby"}
   '';
 
   meta = {
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 5f23dbd8ab28..0a34a6305aa8 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9373,6 +9373,7 @@ in
   rubyPackages_2_4 = recurseIntoAttrs ruby_2_4.gems;
   rubyPackages_2_5 = recurseIntoAttrs ruby_2_5.gems;
   rubyPackages_2_6 = recurseIntoAttrs ruby_2_6.gems;
+  rubyPackages_2_7 = recurseIntoAttrs ruby_2_7.gems;
 
   mruby = callPackage ../development/compilers/mruby { };