The command "eval bundle install --jobs=3 --retry=3 --deployment " failed

Hi, the gh-pages build is showing this issue in the logs. What exactly do I need to fix to get this to work? Previous builds have worked without issues. Not sure what changed now.

$ bundle install --jobs=3 --retry=3 --deployment

/home/travis/.rvm/rubies/ruby-2.3.3/lib/ruby/site_ruby/2.3.0/rubygems.rb:275:in `find_spec_for_exe': Could not find 'bundler' (1.16.6) required by your /home/travis/build/adityabidikar/ (Gem::GemNotFoundException)
To update to the latest version installed on your system, run `bundle update --bundler`.
To install the missing version, run `gem install bundler:1.16.6`
from /home/travis/.rvm/rubies/ruby-2.3.3/lib/ruby/site_ruby/2.3.0/rubygems.rb:294:in `activate_bin_path'
from /home/travis/.rvm/gems/ruby-2.3.3/bin/bundle:23:in `<main>'
from /home/travis/.rvm/gems/ruby-2.3.3/bin/ruby_executable_hooks:15:in `eval'
from /home/travis/.rvm/gems/ruby-2.3.3/bin/ruby_executable_hooks:15:in `<main>'

The command "eval bundle install --jobs=3 --retry=3 --deployment " failed. Retrying, 2 of 3.

I’m getting the same error and nothing has changed on my end.