Apple has quietly added a new M1 Mac Mini configuration option to their website with an optional upgrade from the internal 1 Gbps Ethernet to 10 Gbps Ethernet at the time of purchase for 100 USD. The upgrade is only available as a factory option and cannot be added after purchase so those who require 10 GbE will want to purchase the upgrade at the time of purchase. For existing M1 Mac Mini owners it is possible to get 10 GbE with a USB 4 / Thunderbolt 3 dongle such as the OWC Thunderbolt 3 10G which retails for 149 USD. Why Apple has only just now decided to include this 10 GbE upgrade as an option and not with the original launch is unknown.