WordPress has inbuilt latest version upgrade function to notify user about the new release. You should keep track of new release and upgrade your wordpress installation on time if you disable wordpress upgrade notification. It is just easy as you install new plugin on your wp installation

Click on the link below to download wordpress plugin
http://wordpress.org/extend/plugins/disable-wordpress-core-update/

Written by Bala Krishna

Bala Krishna is web developer and occasional blogger from Bhopal, MP, India. He like to share idea, issue he face while working with the code.