Where to keep house deposit

My partner and I are looking at purchasing a house in around 5 years time. Currently the bulk of our deposit is our kiwisavers.

We do have a 90 day on call account which is our house deposit account, currently sitting at 12k and we put $100 in a week but it’s now only yielding 4.10% pa.

Is it best we keep it in this account or given our time frame, into a low/higher risk fund?