diff --git a/Gemfile b/Gemfile
index 51020dbea2e..9dd841d535e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -58,7 +58,6 @@ group :job do
   gem 'qu-redis', require: false
   gem 'delayed_job_active_record', require: false
   gem 'sequel', require: false
-  gem 'celluloid', require: false
 end
 
 # Action Cable
diff --git a/Gemfile.lock b/Gemfile.lock
index 67a0832dfaf..f02a85f70dc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -106,23 +106,6 @@ GEM
     bunny (2.2.1)
       amq-protocol (>= 2.0.0)
     byebug (8.2.1)
-    celluloid (0.17.3)
-      celluloid-essentials
-      celluloid-extras
-      celluloid-fsm
-      celluloid-pool
-      celluloid-supervision
-      timers (>= 4.1.1)
-    celluloid-essentials (0.20.5)
-      timers (>= 4.1.1)
-    celluloid-extras (0.20.5)
-      timers (>= 4.1.1)
-    celluloid-fsm (0.20.5)
-      timers (>= 4.1.1)
-    celluloid-pool (0.20.5)
-      timers (>= 4.1.1)
-    celluloid-supervision (0.20.5)
-      timers (>= 4.1.1)
     coffee-rails (4.1.0)
       coffee-script (>= 2.2.0)
       railties (>= 4.0.0, < 5.0)
@@ -154,7 +137,6 @@ GEM
     globalid (0.3.6)
       activesupport (>= 4.1.0)
     hiredis (0.5.2)
-    hitimes (1.2.3)
     i18n (0.7.0)
     jquery-rails (4.0.5)
       rails-dom-testing (~> 1.0)
@@ -267,8 +249,6 @@ GEM
     thor (0.19.1)
     thread (0.1.7)
     thread_safe (0.3.5)
-    timers (4.1.1)
-      hitimes
     turbolinks (2.5.3)
       coffee-rails
     tzinfo (1.2.2)
@@ -301,7 +281,6 @@ DEPENDENCIES
   bcrypt-ruby (~> 3.0.0)
   benchmark-ips
   byebug
-  celluloid
   coffee-rails (~> 4.1.0)
   dalli (>= 2.2.1)
   delayed_job
diff --git a/activejob/test/support/integration/adapters/sidekiq.rb b/activejob/test/support/integration/adapters/sidekiq.rb
index 9aa07bcb520..2f19d7dacc9 100644
--- a/activejob/test/support/integration/adapters/sidekiq.rb
+++ b/activejob/test/support/integration/adapters/sidekiq.rb
@@ -26,7 +26,7 @@ module SidekiqJobsManager
       continue_read.close
       death_write.close
 
-      # Celluloid & Sidekiq are not warning-clean :(
+      # Sidekiq is not warning-clean :(
       $VERBOSE = false
 
       $stdin.reopen('/dev/null')
@@ -49,8 +49,6 @@ module SidekiqJobsManager
         self_write.puts("TERM")
       end
 
-      require 'celluloid'
-      Celluloid.logger = nil
       require 'sidekiq/launcher'
       sidekiq = Sidekiq::Launcher.new({queues: ["integration_tests"],
                                        environment: "test",