fixes #3512

.ruby-version

@@ -1 +1 @@
-2.3.1
+2.5.0

Gemfile

@@ -60,7 +60,6 @@ end
 group :production do
   gem 'unicorn-worker-killer'
   gem 'newrelic_rpm'
-  gem 'gctools', :platforms => :ruby
   gem 'capistrano-deploytags', '~> 1.0.0', require: false
 end
 

Gemfile.lock

@@ -130,7 +130,6 @@ GEM
     ffaker (2.8.1)
     ffi (1.9.18)
     ffi (1.9.18-x64-mingw32)
-    gctools (0.2.4)
     get_process_mem (0.2.1)
     globalid (0.4.1)
       activesupport (>= 4.2.0)
@@ -424,7 +423,6 @@ DEPENDENCIES
   dtext_rb!
   factory_girl
   ffaker
-  gctools
   google-api-client
   highline
   httparty
@@ -471,4 +469,4 @@ DEPENDENCIES
   whenever
 
 BUNDLED WITH
-   1.16.0
+   1.16.1

config.ru

@@ -11,9 +11,6 @@ if defined?(Unicorn) && Rails.env.production?
 
   # Max memory size (RSS) per worker
   #use Unicorn::WorkerKiller::Oom, (192*(1024**2)), (256*(1024**2))
-
-  require 'gctools/oobgc'
-  use GC::OOB::UnicornMiddleware
 end
 
 run Rails.application