Update Drupal 8 Core to the latest version
Open your Terminal and Navigate to your Drupal site directory (the directory that has the composer.json file)
To update Drupal 8 core you first need to look into the composer.json file to know the Drupal 8 package name
Then run the composer update command with the correct package name, in our case it’s “drupal/core-recommended”
composer update drupal/core-recommended --with-dependencies
After Drupal 8 core is updated the screen will look like this
Navigate to http://YourSiteName.com/update.php to Apply any database updates and Click Continue
If there are any database updates required click Apply pending updates
If there are no errors Click the Front page link to return to your site
Congratulations you have successfully updated your Drupal core, looking forward to help you do more with Drupal