Gemfile in slack-ruby-bot-server-0.11.1 vs Gemfile in slack-ruby-bot-server-0.12.0

@@ -9,11 +9,11 @@
 when 'activerecord' then
   gem 'activerecord', '~> 5.0.0'
   gem 'otr-activerecord', '~> 1.2.1'
   gem 'cursor_pagination' # rubocop:disable Bundler/OrderedGems
   gem 'pg'
-when nil then
+when nil
   warn "Missing ENV['DATABASE_ADAPTER']."
 else
   warn "Invalid ENV['DATABASE_ADAPTER']: #{ENV['DATABASE_ADAPTER']}."
 end
 
@@ -29,10 +29,10 @@
   gem 'hyperclient'
   gem 'rack-server-pages'
   gem 'rack-test'
   gem 'rake'
   gem 'rspec'
-  gem 'rubocop', '0.58.2'
+  gem 'rubocop', '0.81.0'
   gem 'selenium-webdriver', '~> 3.4.4'
   gem 'vcr'
   gem 'webmock'
 end