1 Backup all files
2 Backup Database
3 Download latest version of WP https://wordpress.org/latest.tar.gz
4 Go to WP document root e.g. /var/www/WordPress/htdocs
5 Delete the old wp-includes and wp-admin directories
6 Do NOT delete your existing wp-content folder. Do NOT delete any files or folders in your existing wp-content directory !!!
7 Copy all files from latest.tar.gz archive to WP document root. (overwrite all)
8 chown -R jenkins:jenkins  /var/www/WordPress
9 chmod -R 664 /var/www/WordPress
10 Run Jenkins job to update all files from repository