Could not compile dependency :snabbkaffe

[tomazbracic]

Trying to install ryanwinchester/exmqtt package where snabbkaffe is a dependency and I get this and don't know how to go past this

iex -S mix                         
Erlang/OTP 27 [erts-15.0.1] [source] [64-bit] [smp:10:10] [ds:10:10:10] [async-threads:1] [jit]

===> Analyzing applications...
===> Compiling snabbkaffe
===> Compiling src/snabbkaffe.erl failed
src/snabbkaffe.erl:104:16: syntax error before: '::'
src/snabbkaffe.erl:125:35: syntax error before: '/'

src/snabbkaffe.erl:114:2: Warning: type predicate2() is unused
src/snabbkaffe.erl:525:72: Warning: expression updates a literal
src/snabbkaffe.erl:532:15: Warning: expression updates a literal
src/snabbkaffe.erl:547:58: Warning: expression updates a literal
src/snabbkaffe.erl:558:63: Warning: expression updates a literal
src/snabbkaffe.erl:569:78: Warning: expression updates a literal
src/snabbkaffe.erl:580:52: Warning: expression updates a literal
src/snabbkaffe.erl:650:54: Warning: expression updates a literal

** (Mix) Could not compile dependency :snabbkaffe, "/Users/tomaz/.asdf/installs/elixir/1.17.2-otp-27/.mix/elixir/1-17/rebar3 bare compile --paths /Users/tomaz/razvoj/ELIXIR_PROJECTS/mqtt_mTLS/testko/_build/dev/lib/*/ebin" command failed. Errors may have been logged above. You can recompile this dependency with "mix deps.compile snabbkaffe --force", update it with "mix deps.update snabbkaffe" or clean it with "mix deps.clean snabbkaffe"

Any suggestions perhaps?

Kind regards,
Tomaz