diff --git a/railties/lib/rails/generators/app_base.rb b/railties/lib/rails/generators/app_base.rb
index c066f748ee..4ec471aad4 100644
--- a/railties/lib/rails/generators/app_base.rb
+++ b/railties/lib/rails/generators/app_base.rb
@@ -203,7 +203,8 @@ module Rails
           [GemfileEntry.path('rails', Rails::Generators::RAILS_DEV_PATH),
            GemfileEntry.github('arel', 'rails/arel')]
         elsif options.edge?
-          [GemfileEntry.github('rails', 'rails/rails')]
+          [GemfileEntry.github('rails', 'rails/rails'),
+           GemfileEntry.github('arel', 'rails/arel')]
         else
           [GemfileEntry.version('rails',
                             Rails::VERSION::STRING,