diff --git a/actionpack/lib/action_controller.rb b/actionpack/lib/action_controller.rb
index 417d2efec236f153fbbe099b6f5905044f97404d..50bc26a80f6b0a236649a3116095c42dbfb88ca3 100644
--- a/actionpack/lib/action_controller.rb
+++ b/actionpack/lib/action_controller.rb
@@ -50,7 +50,7 @@ def self.eager_load!
 end
 
 # Common Active Support usage in Action Controller
-require 'active_support/core_ext/class/attribute_accessors'
+require 'active_support/core_ext/module/attribute_accessors'
 require 'active_support/core_ext/load_error'
 require 'active_support/core_ext/module/attr_internal'
 require 'active_support/core_ext/name_error'
diff --git a/actionpack/lib/action_dispatch/http/mime_type.rb b/actionpack/lib/action_dispatch/http/mime_type.rb
index ef144c3c767e24b7d24e04b1328aafe17c82fead..c92d997a5cb762fa236c95db5d768b35d97440fd 100644
--- a/actionpack/lib/action_dispatch/http/mime_type.rb
+++ b/actionpack/lib/action_dispatch/http/mime_type.rb
@@ -1,5 +1,5 @@
 require 'set'
-require 'active_support/core_ext/class/attribute_accessors'
+require 'active_support/core_ext/module/attribute_accessors'
 require 'active_support/core_ext/string/starts_ends_with'
 
 module Mime
diff --git a/actionpack/lib/action_dispatch/http/response.rb b/actionpack/lib/action_dispatch/http/response.rb
index 5247e61a231afcbe0bb7a2eb35621a02e33cf550..7b2655b2d85bed7b71aa8b48e2492689ae82bfea 100644
--- a/actionpack/lib/action_dispatch/http/response.rb
+++ b/actionpack/lib/action_dispatch/http/response.rb
@@ -1,4 +1,4 @@
-require 'active_support/core_ext/class/attribute_accessors'
+require 'active_support/core_ext/module/attribute_accessors'
 require 'monitor'
 
 module ActionDispatch # :nodoc:
diff --git a/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb b/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb
index 37bf9c8c9f1a62c64f5c628e79fed59d140de12b..377f05c98253b19ef79f4413a0d64c638bba5670 100644
--- a/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb
+++ b/actionpack/lib/action_dispatch/middleware/exception_wrapper.rb
@@ -1,5 +1,5 @@
 require 'action_controller/metal/exceptions'
-require 'active_support/core_ext/class/attribute_accessors'
+require 'active_support/core_ext/module/attribute_accessors'
 
 module ActionDispatch
   class ExceptionWrapper
diff --git a/actionview/lib/action_view/base.rb b/actionview/lib/action_view/base.rb
index caade8f43b6b016392fbb1e80fdae51a1af40f49..8eb7072d0c42fd021583197af8d219f254d3067a 100644
--- a/actionview/lib/action_view/base.rb
+++ b/actionview/lib/action_view/base.rb
@@ -1,5 +1,5 @@
 require 'active_support/core_ext/module/attr_internal'
-require 'active_support/core_ext/class/attribute_accessors'
+require 'active_support/core_ext/module/attribute_accessors'
 require 'active_support/ordered_options'
 require 'action_view/log_subscriber'
 require 'action_view/helpers'
diff --git a/actionview/lib/action_view/helpers/active_model_helper.rb b/actionview/lib/action_view/helpers/active_model_helper.rb
index 901f433c7027edf8865fde5c5251fb347b069b80..d5222e3616f7a951a4ba87a2b94cbab170e4f125 100644
--- a/actionview/lib/action_view/helpers/active_model_helper.rb
+++ b/actionview/lib/action_view/helpers/active_model_helper.rb
@@ -1,4 +1,4 @@
-require 'active_support/core_ext/class/attribute_accessors'
+require 'active_support/core_ext/module/attribute_accessors'
 require 'active_support/core_ext/enumerable'
 
 module ActionView
diff --git a/actionview/lib/action_view/helpers/form_helper.rb b/actionview/lib/action_view/helpers/form_helper.rb
index e672891f7b629c10ca9b917bd10b6e7a62642923..8e66fa13dc7e7dbeb984b87b2949f7cf702bf524 100644
--- a/actionview/lib/action_view/helpers/form_helper.rb
+++ b/actionview/lib/action_view/helpers/form_helper.rb
@@ -4,7 +4,7 @@
 require 'action_view/helpers/form_tag_helper'
 require 'action_view/helpers/active_model_helper'
 require 'action_view/model_naming'
-require 'active_support/core_ext/class/attribute_accessors'
+require 'active_support/core_ext/module/attribute_accessors'
 require 'active_support/core_ext/hash/slice'
 require 'active_support/core_ext/string/output_safety'
 require 'active_support/core_ext/string/inflections'
diff --git a/actionview/lib/action_view/template/resolver.rb b/actionview/lib/action_view/template/resolver.rb
index 3304605c1a72a02e4c3a8c7448fdd4be36c689a5..3279f068c9da1bea43535c46ff149fd1ea0e1d81 100644
--- a/actionview/lib/action_view/template/resolver.rb
+++ b/actionview/lib/action_view/template/resolver.rb
@@ -1,6 +1,6 @@
 require "pathname"
 require "active_support/core_ext/class"
-require "active_support/core_ext/class/attribute_accessors"
+require "active_support/core_ext/module/attribute_accessors"
 require "action_view/template"
 require "thread"
 require "thread_safe"
diff --git a/actionview/lib/action_view/template/types.rb b/actionview/lib/action_view/template/types.rb
index db77cb5d1919569454027fe6b8a85acc772c224a..b84e0281ae49f173f38c79ce7bdf9a71cb0aa331 100644
--- a/actionview/lib/action_view/template/types.rb
+++ b/actionview/lib/action_view/template/types.rb
@@ -1,5 +1,5 @@
 require 'set'
-require 'active_support/core_ext/class/attribute_accessors'
+require 'active_support/core_ext/module/attribute_accessors'
 
 module ActionView
   class Template
diff --git a/actionview/lib/action_view/vendor/html-scanner/html/sanitizer.rb b/actionview/lib/action_view/vendor/html-scanner/html/sanitizer.rb
index 30b6b8b141ce8e35499b83ee51912428f77584d7..ed34eecf558442847dacbdee9189b01dd49f3a22 100644
--- a/actionview/lib/action_view/vendor/html-scanner/html/sanitizer.rb
+++ b/actionview/lib/action_view/vendor/html-scanner/html/sanitizer.rb
@@ -1,6 +1,6 @@
 require 'set'
 require 'cgi'
-require 'active_support/core_ext/class/attribute_accessors'
+require 'active_support/core_ext/module/attribute_accessors'
 
 module HTML
   class Sanitizer
diff --git a/activemodel/lib/active_model/serializers/xml.rb b/activemodel/lib/active_model/serializers/xml.rb
index 2864c2ba11cd0cbbbd1ebcb7634c4e116ac098e2..7f99536dbbc56cc545da1fe24666784654220917 100644
--- a/activemodel/lib/active_model/serializers/xml.rb
+++ b/activemodel/lib/active_model/serializers/xml.rb
@@ -1,4 +1,4 @@
-require 'active_support/core_ext/class/attribute_accessors'
+require 'active_support/core_ext/module/attribute_accessors'
 require 'active_support/core_ext/array/conversions'
 require 'active_support/core_ext/hash/conversions'
 require 'active_support/core_ext/hash/slice'
diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index e05e22ebb0cfbf12e5bdd6b3c8240766f04bd562..1d3ec75aa16d9ef7eb0b108f1b79019b21bc1dde 100644
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -4,7 +4,7 @@
 require 'active_support/dependencies'
 require 'active_support/descendants_tracker'
 require 'active_support/time'
-require 'active_support/core_ext/class/attribute_accessors'
+require 'active_support/core_ext/module/attribute_accessors'
 require 'active_support/core_ext/class/delegating_attributes'
 require 'active_support/core_ext/array/extract_options'
 require 'active_support/core_ext/hash/deep_merge'
diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb
index a4247fb6f48c1e1890f32365e6e427f8df43ebe1..f7e0a388d7ef3396f0ca89ee8862dbdcc01f34d2 100644
--- a/activerecord/lib/active_record/migration.rb
+++ b/activerecord/lib/active_record/migration.rb
@@ -1,4 +1,4 @@
-require "active_support/core_ext/class/attribute_accessors"
+require "active_support/core_ext/module/attribute_accessors"
 require 'set'
 
 module ActiveRecord
diff --git a/activesupport/lib/active_support/cache.rb b/activesupport/lib/active_support/cache.rb
index 5c1d473161d144aa43edb75c3ec5d7370c0b47ab..d584d50da83bc647bde3ee6e12a317eb3ed13df1 100644
--- a/activesupport/lib/active_support/cache.rb
+++ b/activesupport/lib/active_support/cache.rb
@@ -3,7 +3,7 @@
 require 'active_support/core_ext/array/extract_options'
 require 'active_support/core_ext/array/wrap'
 require 'active_support/core_ext/benchmark'
-require 'active_support/core_ext/class/attribute_accessors'
+require 'active_support/core_ext/module/attribute_accessors'
 require 'active_support/core_ext/numeric/bytes'
 require 'active_support/core_ext/numeric/time'
 require 'active_support/core_ext/object/to_param'
diff --git a/activesupport/lib/active_support/logger.rb b/activesupport/lib/active_support/logger.rb
index 4a55bbb35030f4909f83d66f35155f10ae6a5d51..33fccdcf95161978075b079f2d6ffe2253e03618 100644
--- a/activesupport/lib/active_support/logger.rb
+++ b/activesupport/lib/active_support/logger.rb
@@ -1,4 +1,4 @@
-require 'active_support/core_ext/class/attribute_accessors'
+require 'active_support/core_ext/module/attribute_accessors'
 require 'active_support/logger_silence'
 require 'logger'