BTW, Insert the following code to the functions.php (better in your Child WP theme) file of your active theme. It will remove the WordPress update nag -> WordPress update is available!
/*Remove WP update notification*/
function remove_core_updates() {
if (!current_user_can('update_core')) {
return;
}
add_action('init', create_function('$a', "remove_action( 'init', 'wp_version_check' );"), 2);
add_filter('pre_option_update_core', '__return_null');
add_filter('pre_site_transient_update_core', '__return_null');
}
add_action('after_setup_theme', 'remove_core_updates');
This code below disables all the updates notifications regarding plugins, themes & WordPress completely:
/* Remove ALL WP update notifications */
function remove_core_updates() {
global $wp_version;
return (object) array('last_checked' => time(), 'version_checked' => $wp_version,);
}
add_filter('pre_site_transient_update_core', 'remove_core_updates');
add_filter('pre_site_transient_update_plugins', 'remove_core_updates');
add_filter('pre_site_transient_update_themes', 'remove_core_updates');