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 Hemant Patel

Hemant, hailing from Bhopal, Madhya Pradesh, India, is a web developer and occasional blogger passionate about exchanging ideas and addressing problems in his coding journey.