Disable Update Notification on WordPress

functions.php

/**
 * Remove update notification
 * Applies to WordPress Core, Plugins, Themes
 */
// disable for core
add_filter('pre_site_transient_update_core','remove_wp_update_notification');

// disable for plugins
add_filter('pre_site_transient_update_plugins','remove_wp_update_notification');

// disable for themes
add_filter('pre_site_transient_update_themes','remove_wp_update_notification');

// function being called by filter hook
function remove_wp_update_notification() {
	global $wp_version;
	return(object) array('last_checked'=> time(),'version_checked'=> $wp_version,); 
    }