This article describes several methods for updating a Drupal site.
You should update a Drupal installation frequently to ensure it is running the latest version. There are several reasons for this:
Use one of the following methods to update Drupal.
You can update Drupal from the command line using Drush. This method is quick and easy, and it also enables automation possibilities—for example, you could run Drush in a daily cron job to ensure that your Drupal site is always up to date.
For information about how to update Drupal using Drush, please see this article.
If you used Softaculous to install Drupal, you can also use it to update Drupal. For information about how to do this, please see this article.
For detailed instructions about how to do a manual update, please see the official Drupal documentation at https://www.drupal.org/node/1494290.