Google Cloud API doesn't work with embulk v.0.10.2

[DevRockstarZ]

Full error message is :

The Google Cloud API clients work best on supported versions of Ruby. Consider upgrading to Ruby 2.4 or later
See https://www.ruby-lang.org/en/downloads/branches/ for more info on the Ruby maintenance schedule
To suppress this message, set the GOOGLE_CLOUD_SUPPRESS_RUBY_WARNINGS environment variable.

How can I solve it?

I installed embulk on debian version 9.

Thanks.