Not updating quantity field

Hi there! First of all, great little plugin!

I just have one problem, the quantities are not updating.
The javascript error i get is:

Uncaught ReferenceError: wc_checkout_params is not defined

Code reference:

var data = {
                    		action: 'cqoc_update_order_review',
                    		security: wc_checkout_params.update_order_review_nonce,
                    		post_data: jQuery( 'form.checkout' ).serialize()
                    	};

It looks like the wc_checkout_params is deprecated.