diff -ur /usr/lib/ruby/gems/1.9.1/gems/capistrano-2.15.5/lib/capistrano/recipes/deploy.rb ./lib/capistrano/recipes/deploy.rb
--- ./lib/capistrano/recipes/deploy.rb	2014-08-13 15:11:31.423773610 +0200
+++ /usr/lib/ruby/gems/1.9.1/gems/capistrano-2.15.5/lib/capistrano/recipes/deploy.rb	2014-05-04 11:40:39.000000000 +0200
@@ -462,7 +462,7 @@
   DESC
   task :cleanup, :except => { :no_release => true } do
     count = fetch(:keep_releases, 5).to_i
-    try_sudo "ls -1dt #{releases_path}/* | tail -n +#{count + 1} | #{try_sudo} xargs rm -rf"
+    run "ls -1dt #{releases_path}/* | tail -n +#{count + 1} | #{try_sudo} xargs rm -rf"
   end
 
   desc <<-DESC