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The DMO plans to issue NZ$7 billion ($4.91 billion) in 2017/18, compared to NZ$7 billion in the pre-election update in August.
It raised its issuance plans for 2020/21 to NZ$7 billion from NZ$6 billion in its pre-election update.
The new Labour-led government, which took the helm in October, has said it will reduce government debt at a slower pace than the previous ruling National-led regime as it seeks to boost spending on social services.
New Zealand is targeting net debt to gross domestic product of 20 percent by 2022 from a forecast 21.7 in 2018.