1st Method
Internally, Anaconda has not updated to 3.6
You want to type
conda update python
Then, if you want to update a major python version, for example/- 3.5 to 3.6, you have to type
conda install python=$pythonversion$
2nd Method:
Its time to create a new environment
conda create --name py36 python=3.6
Next method:-
To get the latest version, type
conda create --name py365 python=3.6.5 --channel conda-forge
you can type your latest version at 3.6.5
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