How to update cart item meta - woocommerce

Question

I know we can add meta for woocommerce cart item using woocommerce_add_cart_item_data hook.

Is there any way to update existing cart item meta.?

Answer 1

Yes, but it seems, only via accessing the cart directly:

global $woocommerce;
$woocommerce->cart->cart_contents[$cart_item_key]['whatever_meta'] = 'testing';
$woocommerce->cart->set_session();   // when in ajax calls, saves it.

I would recommend to remove and re-add the product, as other meta data could be lost (as in Phong Tran's answer).

Based on @DanielSalcedos answer, only keeping the absolute minimum required to answer the question.