How can I get iterm to use the newer version of bash that brew shows?

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When I do this I see the newer version. How can I use it?

$ bash -version
GNU bash, version 3.2.51(1)-release (x86_64-apple-darwin13)
Copyright (C) 2007 Free Software Foundation, Inc.
$ brew upgrade bash
Error: bash-4.2.45 already installed
$ which bash
/bin/bash

asked 32 secs ago

Michael Durrant

27.8k