Using with Elixir Specify your Mix dependencies as two-item tuples like {:plug, "~> 1.1.0"} in your dependency list, Elixir will ask if you want to install Hex if you haven't already. Using with Erlang Download rebar3, put it in your PATH and give it executable permissions. Now you can specify Hex dependencies in your rebar.config like {deps, [hackney]}. Getting started Fetch dependencies from Hex