As a part of this release, Storefront was tested with the recently released WordPress 5.5 and the pending WooCommerce 4.4 release.
Here’s what’s new in 2.6.0 (pulled directly from the changelog):
Download the latest release of Storefront from WordPress.org, or venture over to
Dashboard → Updates in your WordPress admin to update your theme.
As usual, if you see any issues, please log them in detail on Github.