diff --git a/actionpack/lib/abstract_controller/rendering.rb b/actionpack/lib/abstract_controller/rendering.rb
index 2cb22cb53d..a0560a8748 100644
--- a/actionpack/lib/abstract_controller/rendering.rb
+++ b/actionpack/lib/abstract_controller/rendering.rb
@@ -1,6 +1,4 @@
 require "abstract_controller/error"
-require "active_support/concern"
-require "active_support/core_ext/class/attribute"
 require "action_view"
 require "action_view/view_paths"
 require "set"
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index a1bc357c8b..326329c65f 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -1,5 +1,4 @@
 require "action_dispatch/journey"
-require "active_support/concern"
 require "active_support/core_ext/object/to_query"
 require "active_support/core_ext/hash/slice"
 require "active_support/core_ext/module/remove_method"
diff --git a/actionview/lib/action_view/template.rb b/actionview/lib/action_view/template.rb
index c01dd1c028..98571cf55e 100644
--- a/actionview/lib/action_view/template.rb
+++ b/actionview/lib/action_view/template.rb
@@ -1,6 +1,5 @@
 require "active_support/core_ext/object/try"
 require "active_support/core_ext/kernel/singleton_class"
-require "active_support/core_ext/module/delegation"
 require "thread"
 
 module ActionView
diff --git a/activejob/lib/active_job/queue_adapter.rb b/activejob/lib/active_job/queue_adapter.rb
index 2e9f1e61be..bcc555d33e 100644
--- a/activejob/lib/active_job/queue_adapter.rb
+++ b/activejob/lib/active_job/queue_adapter.rb
@@ -1,5 +1,4 @@
 require "active_job/queue_adapters/inline_adapter"
-require "active_support/core_ext/class/attribute"
 require "active_support/core_ext/string/inflections"
 
 module ActiveJob
diff --git a/activejob/test/support/integration/test_case_helpers.rb b/activejob/test/support/integration/test_case_helpers.rb
index 4c4c56c9da..da8638895b 100644
--- a/activejob/test/support/integration/test_case_helpers.rb
+++ b/activejob/test/support/integration/test_case_helpers.rb
@@ -1,4 +1,3 @@
-require "active_support/concern"
 require "active_support/core_ext/string/inflections"
 require "support/integration/jobs_manager"
 
diff --git a/activemodel/lib/active_model/naming.rb b/activemodel/lib/active_model/naming.rb
index 3830d1486d..840fc663c0 100644
--- a/activemodel/lib/active_model/naming.rb
+++ b/activemodel/lib/active_model/naming.rb
@@ -1,7 +1,6 @@
 require "active_support/core_ext/hash/except"
 require "active_support/core_ext/module/introspection"
 require "active_support/core_ext/module/remove_method"
-require "active_support/core_ext/module/delegation"
 
 module ActiveModel
   class Name
diff --git a/activerecord/lib/active_record/relation/delegation.rb b/activerecord/lib/active_record/relation/delegation.rb
index ac933d25ae..4b9310b225 100644
--- a/activerecord/lib/active_record/relation/delegation.rb
+++ b/activerecord/lib/active_record/relation/delegation.rb
@@ -1,5 +1,3 @@
-require "active_support/concern"
-
 module ActiveRecord
   module Delegation # :nodoc:
     module DelegateCache # :nodoc: