HomeBase is designed for a hassle-free user experience; it will check and update to new firmware versions (when available) when idle. 

And when you first install HomeBase, the eufy app will run a firmware version check automatically to ensure HomeBase is updated to the latest firmware version. 

You can manually update the devices' software as well in the Side Menu > My Devices > Select Devices > Devices Settings > Devices Info > Check for firmware's update.