diff --git a/activemodel/lib/active_model/attribute_set.rb b/activemodel/lib/active_model/attribute_set.rb
index 54a5dd406411b9cd82487018490ed657860f73f9..a890ee3932c5debdc1148de7702f8f1f980ec4b9 100644
--- a/activemodel/lib/active_model/attribute_set.rb
+++ b/activemodel/lib/active_model/attribute_set.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "active_support/core_ext/object/deep_dup"
 require "active_model/attribute_set/builder"
 require "active_model/attribute_set/yaml_encoder"
 
diff --git a/activemodel/lib/active_model/attributes.rb b/activemodel/lib/active_model/attributes.rb
index cac461b54930fa64b43f02350c2c39142aea3747..28dd24b3cd67192938518602dbed9f2105409524 100644
--- a/activemodel/lib/active_model/attributes.rb
+++ b/activemodel/lib/active_model/attributes.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require "active_support/core_ext/object/deep_dup"
 require "active_model/attribute_set"
 require "active_model/attribute/user_provided_default"