disable-wordpress-update-nag.php

/**
 * Disable WordPress Update nag
 * https://orixlab.net/disable-updates-for-specific-plugin-in-wordpress
 * Place at bottom in theme functions.php
 */

add_action('after_setup_theme','remove_core_updates');
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');
}