brew升级“已安装python 3.6.5”，但python版本为3.6.4

Question

brew upgrade提示“python3.6.5已经安装”`

$ brew upgrade python
Updated 2 taps (homebrew/core, caskroom/cask).
==> Updated Formulae
aria2              cake               debianutils        grpc               sops               you-get
aws-sdk-cpp        dbxml              fdroidserver       pilosa             xqilla

Error: python 3.6.5 already installed

但是

^{pr2}$

如何升级在环境中运行的指定python？在