I use asdf for managing elixir and erlang version.
> asdf info
OS:
Darwin MacBook-Pro.local 19.6.0 Darwin Kernel Version 19.6.0: Mon Aug 31 22:12:52 PDT 2020; root:xnu-6153.141.2~1/RELEASE_X86_64 x86_64
SHELL:
fish, version 3.1.2
ASDF VERSION:
v0.8.0-c6145d0
ASDF ENVIRONMENT VARIABLES:
ASDF_DIR=/Users/papillon/.asdf
ASDF INSTALLED PLUGINS:
elixir https://github.com/asdf-vm/asdf-elixir.git
erlang https://github.com/asdf-vm/asdf-erlang.git
> elixir -v
Erlang/OTP 23 [erts-11.0.4] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [hipe]
Elixir 1.9.4 (compiled with Erlang/OTP 20)
> erl +V
Erlang (SMP,ASYNC_THREADS,HIPE) (BEAM) emulator version 11.0.4
