Open source Graph database company Dgraph has raised a $6 million seed re-financing round.

The investment was led by Venrock and Uncorrelated Ventures, with participation from Abstract Ventures, HackVC, SaxeCap, and Liquid2 Ventures.

DJ Patil, former US Chief Data Scientist; Michael Callahan, founder of Awake Security; Ry Walker, founder of Astronomer; Ganesh Srinivasan, chief product officer at Confluent; Chris Riccomini; and JP Patil, head of Data at Included Health, also participated in the investments.