Is there any plan to upgrade the Erlang version from R16B03-1 to the latest or next major version?

After installing the latest Couchbase Server 5.0.1 on Ubuntu 16.03, running the following command:
$ /opt/couchbase/lib/erlang/bin/erl

The banner of erl shell shows that the Erlang version Couchbase server used is still R16B03-1.

There have lots of improvement after R16B03 in Erlang and OTP, so it will also improve Couchbase server if upgrade the Erlang version Couchbase server depends on.

SO is there any plan to upgrade it? Thanks!