You can update new price using below method –
$order_id = 123;
$order = wc_get_order( $order_id );
foreach( $order->get_items() as $item_id => $item ){
$new_product_price = 30;
$product_quantity = (int) $item->get_quantity();
$new_line_item_price = $new_product_price * $product_quantity;
$item->set_subtotal( $new_line_item_price );
$item->set_total( $new_line_item_price );
$item->save(); // Save line item data
}
$order->calculate_totals();
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