diff --git a/lib/tasks/heroku.rake b/lib/tasks/heroku.rake
index e69de29b..af2dddf9 100644
--- a/lib/tasks/heroku.rake
+++ b/lib/tasks/heroku.rake
@@ -0,0 +1,15 @@
+namespace :heroku do
+  desc "Generate the Heroku gems manifest from gem dependencies"
+  task :gems do
+    RAILS_ENV='production'
+    Rake::Task[:environment].invoke
+    list = Rails.configuration.gems.collect do |g| 
+      command, *options = g.send(:install_command)
+      options.join(" ") + "\n"
+    end
+    
+    File.open(File.join(RAILS_ROOT, '.gems'), 'w') do |f|
+      f.write(list)
+    end
+  end
+end
\ No newline at end of file