Disable Update WordPress nags with Plugin’s and Theme’s Update Notifications

1. To Disable Update WordPress nag :

Insert the following code to the functions.php file of your active theme. It will remove the WordPress update nag e.g. WordPress 3.9.1 is available! Please update now, from the all users dashboard, admin dashboard & from Updates page as well.

2. To Disable Plugin Update Notifications :

Insert the following code to the functions.php file of your active theme. It will remove the update notifications of all the installed plugins.

3. To Disable all the Nags & Notifications :

Insert the following code the functions.php file of your active theme. This code disables all the updates notifications regarding plugins, themes & WordPress completely.