[Python] Update value of a nested dictionary of varying depth

I'm looking for a way to update dict dictionary1 with the contents of dict update wihout overwriting levelA

dictionary1 = {
"level1": {
"level2": {"levelA": 0, "levelB": 1}
}
}
update = {
"level1": {
"level2": {"levelB": 10}
}
}
dictionary1.update(update)
print(dictionary1)


{
"level1": {
"level2": {"levelB": 10}
}
}


I know that update deletes the values in level2 because it's updating the lowest key level1.

How could I tackle this, given that dictionary1 and update can have any length?

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