[Python] How to replace existing key in a dictionary in python?

I want to replace the specific existing key at index 1 in a dictionary in python.

from collections import OrderedDict
regDict= OrderedDict()
regDict[("glenn")] = 1
regDict[("elena")] = 2
print("dict",regDict)


prints:

dict OrderedDict([('glenn', 1), ('elena', 2)])


target output:

dict OrderedDict([('glenn', 1), ('new', 2)]) # replacing key in index 1

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