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-rw-r--r--activemodel/lib/active_model/dirty.rb1
1 files changed, 0 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/dirty.rb b/activemodel/lib/active_model/dirty.rb
index 1dfd0b6132..a479795d51 100644
--- a/activemodel/lib/active_model/dirty.rb
+++ b/activemodel/lib/active_model/dirty.rb
@@ -1,5 +1,4 @@
require 'active_model/attribute_methods'
-require 'active_support/concern'
require 'active_support/hash_with_indifferent_access'
require 'active_support/core_ext/object/duplicable'