Out of memory error when trying to update addthis to 7.x-4.0-alpha1 via Drush

"drush pm-update addthis" gives me the following errors. Any ideas?

Do you really want to continue with the update process? (y/n): y
Project addthis was updated successfully. Installed version is now 7.x-4.0-alpha1.
Backups were saved into the directory /home/ken/drush-backups/cbf_drupal_712/20120316141508/modules/addthis.                                                  [ok]
The external command could not be executed due to an application error.                                                                                       [error]
The command could not be executed successfully (returned: PHP Fatal error:  Allowed memory size of 134217728 bytes exhausted (tried to allocate 343921 bytes) [error]
in /var/www/ken/includes/cache.inc on line 444
PHP Stack trace:
PHP   1. {main}() /home/ken/drush/drush.php:0
PHP   2. drush_main() /home/ken/drush/drush.php:14
PHP   3. _drush_bootstrap_and_dispatch() /home/ken/drush/drush.php:59
PHP   4. drush_dispatch() /home/ken/drush/drush.php:90
PHP   5. call_user_func_array() /home/ken/drush/includes/command.inc:159
PHP   6. drush_command() /home/ken/drush/includes/command.inc:0
PHP   7. _drush_invoke_hooks() /home/ken/drush/includes/command.inc:192
PHP   8. call_user_func_array() /home/ken/drush/includes/command.inc:318
PHP   9. drush_pm_updatecode_postupdate() /home/ken/drush/includes/command.inc:0
PHP  10. drush_drupal_cache_clear_all() /home/ken/drush/commands/pm/pm.drush.inc:1209
PHP  11. drush_invoke() /home/ken/drush/includes/drupal.inc:36
PHP  12. drush_dispatch() /home/ken/drush/includes/command.inc:38
PHP  13. call_user_func_array() /home/ken/drush/includes/command.inc:159
PHP  14. drush_command() /home/ken/drush/includes/command.inc:0
PHP  15. _drush_invoke_hooks() /home/ken/drush/includes/command.inc:192
PHP  16. call_user_func_array() /home/ken/drush/includes/command.inc:318
PHP  17. drush_cache_command_clear() /home/ken/drush/includes/command.inc:0
PHP  18. drush_op() /home/ken/drush/commands/core/cache.drush.inc:79
PHP  19. call_user_func_array() /home/ken/drush/includes/drush.inc:792
PHP  20. drush_cache_clear_both() /home/ken/drush/includes/drush.inc:0
PHP  21. drupal_flush_all_caches() /home/ken/drush/commands/core/cache.drush.inc:236
PHP  22. menu_rebuild() /var/www/ken/includes/common.inc:7258
PHP  23. menu_router_build() /var/www/ken/includes/menu.inc:2698
PHP  24. drupal_alter() /var/www/ken/includes/menu.inc:2738
PHP  25. views_menu_alter() /var/www/ken/includes/module.inc:1018
PHP  26. view->execute_hook_menu() /var/www/ken/sites/all/modules/views/views.module:349
PHP  27. views_plugin_display_page->execute_hook_menu() /var/www/ken/sites/all/modules/views/includes/view.inc:1352
PHP  28. view->init_handlers() /var/www/ken/sites/all/modules/views/plugins/views_plugin_display_page.inc:58
PHP  29. view->fix_missing_relationships() /var/www/ken/sites/all/modules/views/includes/view.inc:644
PHP  30. views_move_table() /var/www/ken/sites/all/modules/views/includes/view.inc:589
PHP  31. views_fetch_data() /var/www/ken/sites/all/modules/views/views.module:1506
PHP  32. _views_fetch_data() /var/www/ken/sites/all/modules/views/views.module:1175
PHP  33. views_cache_set() /var/www/ken/sites/all/modules/views/includes/cache.inc:37
PHP  34. cache_set() /var/www/ken/sites/all/modules/views/includes/cache.inc:141
PHP  35. DrupalDatabaseCache->set() /var/www/ken/includes/cache.inc:147
PHP  36. serialize() /var/www/ken/includes/cache.inc:444
, code: <em class="placeholder">255</em>)
Backups were restored successfully.                                                                                                                           [ok]