Hide the WordPress update notification to all but admins.
<?php
function ccd_admin_only_updates() {
if ( ! current_user_can( 'update_core' ) ) {
remove_action( 'admin_notices', 'update_nag', 3 );
}
}
add_action( 'admin_head', 'ccd_admin_only_updates', 1 );
?>
WordPress Snippet