TypeError: unhashable type: 'set'

[Stager]

Hi all

I have two dictionaries, containing (for example):

dict1 = {'k1':{1,2,3},'k2':{4,5,6},'k3':{7,8,9}}
dict2 = {1:12,2:23,3:34,4:45,5:56,6:67,7:78,8:89,9:90}

I want to find the dict1 set value, having max of dict2 value.
I do:

print(max(list(dict1.values()),key=dict2.get))

and get "TypeError: unhashable type: 'set'"

What am I doing wrong?