Apptronik, a humanoid robot maker backed by Google, is in the process of raising at least $400 million at a $5 billion valuation not including the new money, according to two people familiar with the discussions.

The new round, led by B Capital, would at least triple the startup’s valuation from earlier this year, when it raised $415 million from investors including Austin’s Capital Factory and venture firm B Capital. Google will invest in the latest round, too, according to those people. Apptronik is developing Apollo: a two-legged, two-armed robot. Late last year, the company said Google would start supplying AI from its DeepMind lab to power the robots.