issue with up-to-date versions of rails

[sam0x17]

I am getting this when ralis s boots:

=> Booting Puma
=> Rails 5.0.4 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
DEPRECATION WARNING: Sprockets method `register_engine` is deprecated.
Please register a mime type using `register_mime_type` then
use `register_compressor` or `register_transformer`.
https://github.com/rails/sprockets/blob/master/guides/extending_sprockets.md#supporting-all-versions-of-sp
s
 (called from block in <class:Railtie> at /home/sam/.rvm/gems/ruby-2.3.3/gems/less-rails-2.8.0/lib/less/ra
DEPRECATION WARNING: You are using the a deprecated processor interface Less::Rails::ImportProcessor.
Please update your processor interface:
https://github.com/rails/sprockets/blob/master/guides/extending_sprockets.md#supporting-all-versions-of-sp
s
 (called from block in <class:Railtie> at /home/sam/.rvm/gems/ruby-2.3.3/gems/less-rails-2.8.0/lib/less/ra
Puma starting in single mode...
* Version 3.9.1 (ruby 2.3.3-p222), codename: Private Caller
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:3000
Use Ctrl-C to stop

[rubyandcoffee]

I'm also getting the same issue. I tried updating the less-rails gem but can't because of twitter-bootstrap-rails dependencies.

[sam0x17]

would be great if someone could bring this up-to-date