Ruby on Rails

In my application whenever I try to start rails server following warning pop-up

/home/deepak/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:51:
warning: constant ::Fixnum is deprecated
/home/deepak/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:52:
warning: constant ::Bignum is deprecated
=> Booting Puma
=> Rails 5.0.1 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
/home/deepak/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/activesupport-5.0.1/lib/active_support/core_ext/numeric/conversions.rb:138:
warning: constant ::Fixnum is deprecated
Puma starting in single mode...
* Version 3.6.2 (ruby 2.4.0-p0), codename: Sleepy Sunday Serenity
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://localhost:3000
Use Ctrl-C to stop


Is it something from backend or I'm missing something to install on my
machine which produce this.

--
Cheers!

Deepak Kumar Sharma

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