Для тех, кто использует Drush, есть очень простой способ обновить Drupal, используя команду:
drush pm-update
В итоге на запрос обновления нажимаем y и enter:
drush pm-update
Name Installed Version Proposed version Message
Drupal 7.26 7.27 SECURITY UPDATE available
Update information last refreshed: чт, 04/24/2014 - 14:57
Code updates will be made to drupal core.
WARNING: Updating core will discard any modifications made to Drupal core files, most noteworthy among these are .htaccess and robots.txt. If you have made any modifications to these files, please back them up before updating so that you can re-create your modifications in the updated version of the file.
Note: Updating core can potentially break your site. It is NOT recommended to update production sites without prior testing.
Do you really want to continue? (y/n): y