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-rw-r--r--actionmailer/lib/action_mailer.rb1
1 files changed, 0 insertions, 1 deletions
diff --git a/actionmailer/lib/action_mailer.rb b/actionmailer/lib/action_mailer.rb
index 9bd73dd740..2ac4f3f681 100644
--- a/actionmailer/lib/action_mailer.rb
+++ b/actionmailer/lib/action_mailer.rb
@@ -31,7 +31,6 @@ require 'action_mailer/version'
# Common Active Support usage in Action Mailer
require 'active_support/core_ext/class'
require 'active_support/core_ext/object/blank'
-require 'active_support/core_ext/array/uniq_by'
require 'active_support/core_ext/module/attr_internal'
require 'active_support/core_ext/module/delegation'
require 'active_support/core_ext/string/inflections'