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-rw-r--r--activesupport/lib/active_support/core_ext/hash.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/hash.rb b/activesupport/lib/active_support/core_ext/hash.rb
index 501483498d..fd1cda991e 100644
--- a/activesupport/lib/active_support/core_ext/hash.rb
+++ b/activesupport/lib/active_support/core_ext/hash.rb
@@ -1,5 +1,6 @@
require 'active_support/core_ext/hash/conversions'
require 'active_support/core_ext/hash/deep_merge'
+require 'active_support/core_ext/hash/deep_dup'
require 'active_support/core_ext/hash/diff'
require 'active_support/core_ext/hash/except'
require 'active_support/core_ext/hash/indifferent_access'