The current Joomla version is displayed in both the Portal Joomla dashboard and the Joomla admin. You can update to the latest version through the Joomla dashboard his will update the core Joomla using Joomla’s built-in upgrade functions.
To Update Your Joomla Version:
On the Installer screen, click Update Joomla
Note: The Update button is greyed out if you are running the latest version.
Alternatively, you can click Edit Site and update the version from within the Joomla admin panel.