{Deps0, Config0} = case lists:keytake(deps, 1, CONFIG) of
                       false -> {[], CONFIG};
                       {value, {deps, D}, Cfg} -> {D, Cfg}
                   end,

Deps = case list_to_integer(erlang:system_info(otp_release)) of
           N when N >= 27 ->
               Deps0;
           N when N >= 21 ->
               [{jsx, "3.1.0"} | Deps0];
           _ ->
               [{jsx, "3.1.0"}, {rfc3339, "0.9.0"} | Deps0]
       end,

[{deps, Deps} | Config0].