"We would want to be sure passports were protected because New Zealand's is a very desirable passport for people to hold and you wouldn't want to get to the point where people thought in any way that those passports were compromised because it would make it more inconvenient for New Zealanders to travel."
He said the view appeared to be that biometrics technology had improved dramatically, which made the move possible.
Previously, officials' advice has been that passports needed to be shorter term to allay security concerns and keep up with techonology changes. It was also claimed that changing to a longer term could jeopardise New Zealand's visa-free agreements with other countries because it risked reducing confidence in the passport system.
The select committee's report was in response to a petition by Australian-based Kyle Lockwood.
Mr Dunne said he was getting advice on a range of options and had asked for more information on fees for different validity periods to ensure any changes to fees covered processing costs but were not unreasonable.
He said another option was extending passports to five years nine months, which would at least ensure the 5-year passport was valid for that time because many countries require passports to have at least six months left.
The Department of Internal Affairs recently dropped passport fees but was criticised for keeping them high for longer than had been needed to cover the costs of the original change to 5-year passports.