How to use 3 prong dryer cord in a 4 prong outlet?

I just moved to a house that has a 4 prong dryer outlet. My dryer is from the 1970s and has a 3 prong cord. I love my dryer and want to keep it (don't make them like they used to!) What is the best way to get this to work? Can I simply change the dryer cord or should I change the outlet?

Thank you!
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