You can hinge the motherboard out of the frame without releasing the video card cable. This will give you access to the RAM slot.

The Chromebase uses standard a PC3L-12800 SO-DIMM. This is a low-power (1.35 V) chip commonly used in Atom and Celeron machines and laptops of the era, including the Intel NUC. Most Chromebase machines have 2 GB or RAM, though some reportedly have a 4 GB SO-DIMM. I replaced mine with an 8 GB SO-DIMM and it works perfectly.

There are no other user-upgradeable components, though the Wi-Fi card is easy to replace.