Gem::InstallError: zeitwerk requires Ruby version >= 2.4.4.

[wellington1993]

I have some problems em try to run bundle install:

In Gemfile:
  fhir_client was resolved to 4.0.4, which depends on
    activesupport was resolved to 6.0.3.2, which depends on
      zeitwerk
Bundler::InstallError: Gem::InstallError: zeitwerk requires Ruby version >= 2.4.4.

and

Fetching zeitwerk 2.4.0
Installing zeitwerk 2.4.0
Gem::InstallError: zeitwerk requires Ruby version >= 2.4.4.

and

An error occurred while installing zeitwerk (2.4.0), and Bundler cannot continue.
Make sure that `gem install zeitwerk -v '2.4.0' --source 'https://rubygems.org/'` succeeds before bundling.

and

Could not find gem 'pry' in any of the gem sources listed in your Gemfile.

Someone could help me?
And if possible share the gem list with current dependencies versions and the ruby version used.

Thanks in a lot!