Version mismatch between erl and rebar?

[mattiasw2]

I have an erlang project and this is my minimum boxfile:

run.config:
  engine: erlang
  
  extra_packages:
    - rebar
#    - relx

In the nanobox run, I do rebar get-deps get

/app $ rebar get-deps

=ERROR REPORT==== 24-Jan-2018::12:05:01 ===
Loading of /data/bin/rebar/rebar/ebin/rebar.beam failed: badfile

=ERROR REPORT==== 24-Jan-2018::12:05:01 ===
beam/beam_load.c(1189): Error loading module rebar:
  mandatory chunk of type 'Atom' not found


escript: exception error: undefined function rebar:main/1
  in function  escript:run/2 (escript.erl, line 757)
  in call from escript:start/1 (escript.erl, line 277)
  in call from init:start_it/1 
  in call from init:start_em/1 
/app $