You need to do a manual update as follows:
Backup both files and database of your site, to offline location.
Now, delete wp-admin and wp-includes from old location
Copy over wp-admin and wp-includes from new location
Copy (without subdirectories) all files from root of wordpress zip(tar) file.
More detailed instructions are here.
Joel G Mathew, known in tech circles by the pseudonym Droidzone, is an opensource and programming enthusiast.
His favorite pastime is grappling with GNU compilers, discovering newer Linux secrets, writing scripts, hacking roms, and programs (nothing illegal), reading, blogging. and testing out the latest gadgets.
When away from the tech world, Dr Joel G. Mathew is a practising ENT Surgeon, busy with surgeries and clinical practise.