we are theme developers and we already use select2 (http://select2.github.io/) script for SELECT boxes in HTML in our wordpress theme. New WooCommerce 2.3.x that just relase
There's been some recent changes to WooCommerce (v 3.2.1) in which they forked the select2 script and so the code above by @Dmitry is no longer functional. The new code which worked for me is below..
add_action( 'wp_enqueue_scripts', 'agentwp_dequeue_stylesandscripts', 100 );
function agentwp_dequeue_stylesandscripts() {
if ( class_exists( 'woocommerce' ) ) {
wp_dequeue_style( 'selectWoo' );
wp_deregister_style( 'selectWoo' );
wp_dequeue_script( 'selectWoo');
wp_deregister_script('selectWoo');
}
}