diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index 617bb54086..6af9c4f4f3 100644
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -1,17 +1,9 @@
 # frozen_string_literal: true
 
-require "yaml"
 require "active_support/benchmarkable"
 require "active_support/dependencies"
 require "active_support/descendants_tracker"
 require "active_support/time"
-require "active_support/core_ext/module/attribute_accessors"
-require "active_support/core_ext/array/extract_options"
-require "active_support/core_ext/hash/deep_merge"
-require "active_support/core_ext/hash/slice"
-require "active_support/core_ext/string/behavior"
-require "active_support/core_ext/kernel/singleton_class"
-require "active_support/core_ext/module/introspection"
 require "active_support/core_ext/class/subclasses"
 require "active_record/attribute_decorators"
 require "active_record/define_callbacks"