That didn’t work for me either (Edit: I think the rebar.lock may be the issue?), so I replaced it with
{deps, [
{ram, "0.5.0"}
]}.
Unfortunately, I didn’t get any further than that due to the compilation issue discussed in the OTP 25.0-rc3 (release Candidate 3) is released thread. But once that is resolved, I’m looking forward to having a play with this.