diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index <HASH>..<HASH> 100644
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -13,7 +13,6 @@ require 'active_support/core_ext/kernel/singleton_class'
 require 'active_support/core_ext/module/introspection'
 require 'active_support/core_ext/object/duplicable'
 require 'active_support/core_ext/class/subclasses'
-require 'arel'
 require 'active_record/attribute_decorators'
 require 'active_record/errors'
 require 'active_record/log_subscriber'
Remove duplicated `require 'arel'`

It appears first in `lib/active_record.rb`.