Python - How to avoid refer multiple names to one dict

I am struggling with python dictionary. I have two dics named defaultSettings and personalSettings. I want to make function sets personalSettings's values to defaultSettings's values. But I don't want to all changes be applied to defaulSettings.

I tried this code:

defaultSettings = {'s1': 1, 's2':2, 's3':3}

personalSettings = {'s1': 3, 's2':2, 's3':1}

print(defaultSettings)
print(personalSettings)
print('-*-*-*-*-*-*-*-*-*-*-*-*')

personalSettings = defaultSettings

print(defaultSettings)
print(personalSettings)
print('-*-*-*-*-*-*-*-*-*-*-*-*')

personalSettings['s1'] = 5

print(defaultSettings)
print(personalSettings)

And my output is:

{'s1': 1, 's2': 2, 's3': 3}
{'s1': 3, 's2': 2, 's3': 1}
-*-*-*-*-*-*-*-*-*-*-*-*
{'s1': 1, 's2': 2, 's3': 3}
{'s1': 1, 's2': 2, 's3': 3}
-*-*-*-*-*-*-*-*-*-*-*-*
{'s1': 5, 's2': 2, 's3': 3}
{'s1': 5, 's2': 2, 's3': 3}
-*-*-*-*-*-*-*-*-*-*-*-*

If I change a value of personalSettings after personalSettings = defaultSettings, defaultSettings's value changes too. I know this;

But I don't know how avoid this or other way.