When running Drupal 7 drush 5.0 up to update, you may jump into dead loop. I don't want to fix this problem. It may be made by cross module reference or hook. Especially if you are using pantarei_siren profile and using git pull to update the code.
Just give you a solution. First of all, you must run in suexec mode and have write permission to your document directories. The answer is easy; run update in Drupal, jump to Module, click Update, check everything available and run it. Forget any unavailable version in the module update list at this moment.