Hide all WordPress update notifications in dashboard

update-hide.php

<?php


// hide update notifications
function remove_wp_core_updates(){
    global $wp_version;
    return(object) array('last_checked'=> time(),'version_checked'=> $wp_version,);
}
add_filter('pre_site_transient_update_core','remove_wp_core_updates'); //hide updates for WordPress itself
add_filter('pre_site_transient_update_plugins','remove_wp_core_updates'); //hide updates for all plugins
add_filter('pre_site_transient_update_themes','remove_wp_core_updates'); //hide updates for all themes