Interest Rate Risk Management in Fixed Income Portfolio

David is a fixed income portfolio manager for a large institutional investor. He is currently analyzing the impact of interest rate changes on the duration of his portfolio, which consists mainly of government bonds with varying maturities. David expects a significant increase in interest rates over the next year due to anticipated inflationary pressures. He must decide whether to adjust his portfolio's duration to manage this interest rate risk.

In this context, which strategy would be MOST effective for David to mitigate the impact of rising interest rates on his portfolio?