From https://premium.wpmudev.org/blog/hide-the-wordpress-update-notification/
function hide_update_notice_to_all_but_admin_users() { if (!current_user_can('update_core')) { remove_action( 'admin_notices', 'update_nag', 3 ); } } add_action( 'admin_head', 'hide_update_notice_to_all_but_admin_users', 1 );