Erlang version won't update

[oshybrid]

I installed the latest version of erlang.

~ % brew upgrade erlang
Warning: erlang 23.2.4 already installed

But my running version remains to be just 23

% elixir -v
Erlang/OTP 23 [erts-11.1.7] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [hipe] [dtrace]

Elixir 1.11.3 (compiled with Erlang/OTP 23)

For some reason, it is still pointing to the standard version of erlang on my system

 ~ % which erl
/usr/local/bin/erl

Instead of the brew version. I even pointed my profile to the version installed by homebrew under "cellar."

[gromgit]

Upstream chose not to print the full OTP version number in the erl header. Instead, they provide instructions for retrieving such info when required:

In an installed OTP development system, the OTP version can be read from the text file <OTP installation root>/releases/<OTP release number>/OTP_VERSION. The absolute path to the file can by constructed by calling filename:join([code:root_dir(), "releases", erlang:system_info(otp_release), "OTP_VERSION"]).

So one way of getting the full OTP release version is:

$ erl -eval '{ok, Version} = file:read_file(filename:join([code:root_dir(), "releases", erlang:system_info(otp_release), "OTP_VERSION"])), io:fwrite(Version), halt().' -noshell
23.2.4