I received this message from woocommerce.
Your theme (Sydney Pro) contains outdated copies of some WooCommerce template files. These files may need updating to ensure they are compatible with the current version of WooCommerce. You can see which files are affected from the system status page. If in doubt, check with the author of the theme.
Here is what is on the Status page.
sydney-pro-ii/woocommerce/single-product/add-to-cart/grouped.php version 2.1.7 is out of date. The core version is 3.0.7,
sydney-pro-ii/woocommerce/single-product/add-to-cart/simple.php version 2.1.0 is out of date. The core version is 3.0.0
Outdated templates: Learn how to update
What would be the best way to update the templates?