Update WordPress Manual

1. Download WordPress versi terbaru dari http://wordpress.org/download/
2. Extract file hasil download
3. Delete folder lama  wp-includes and wp-admin, bisa malalui FTP
4. Upload folder terbaru wp-includes and wp-admin ke web hosting
5. Upload secara individual file.php dari folder baru wp-content ke folder wp-content yg lama
6. Login ke dashboard (/wp-login.php), lalu update database (dialog udah ada, cukup next2 aja)
7. Selesai…

detail baca di:
http://codex.wordpress.org/Updating_WordPress