How to update the Joomla! CMS
The Joomla! CMS and 3rd Party Extensions are updated separately.
Here we cover how to update only the Joomla! CMS.
How to check for Joomla! CMS updates
The next time you sign into your website's control panel after a new release of the Joomla! CMS becomes available you will see an alert message at the top of the screen.
If you have not recently seen any update alerts for a while, try refreshing your browser.
Perform a FULL backup of your website (database & files) before you update the Joomla! CMS.