We are using unicorn so don't need puma

--- a/Gemfile
+++ b/Gemfile
@@ -161,18 +161,13 @@
 
 # Application server
 gem 'rack', '~> 2.0', '>= 2.0.9'
+gem 'rack-timeout', require: false
 
 group :unicorn do
   gem 'unicorn', '~> 5.5'
   gem 'unicorn-worker-killer', '~> 0.4.4'
 end
 
-group :puma do
-  gem 'gitlab-puma', '~> 4.3.3.gitlab.2', require: false
-  gem 'gitlab-puma_worker_killer', '~> 0.1.1.gitlab.1', require: false
-  gem 'rack-timeout', require: false
-end
-
 # State machine
 gem 'state_machines-activerecord', '~> 0.6.0'