Upgrade wordpress installation

In-built update option

To update using admin interface use:

Login into wordpress using /wp-admin URL
Choose wordpress update option and update wordpress. Note that it may take some time for update to finish.
You can also consider updating all plugins for new wordpress.

To upgrade (or update) wordpress installation use:

Download latest wordpress on management station
Unzip latest wordpress on management station
Deactivate plugins on existing wordpress using admin interface
Delete old wp-includes and wp-admin directories on web server
Upload wp-includes, wp-admin, wp-content and all loose files to web server
If there is .maintenance file delete it
Visit /wp-admin/upgrade.php for upgrading
Reactivate all plugins
Clear cache if caching is enabled
Restart browser or clear cookies if necessary before accessing update site or updated admin page.