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This hasn't been determined yet as we are in the alpha stage of the game.
But I run with 8gb of ram, the game only uses 1gb at most, and your system should take between 2 and 2.5, so I'd say 4GB of ram minimum.
The game is quite CPU heavy, you'll need a fairly recent one.
And as far as GPUs are concerned, I'd say anything with 2gb or more of VRAM should do the trick.