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-rw-r--r--activemodel/lib/active_model/observing.rb1
1 files changed, 0 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/observing.rb b/activemodel/lib/active_model/observing.rb
index 9e99d7472c..d3c6d8e482 100644
--- a/activemodel/lib/active_model/observing.rb
+++ b/activemodel/lib/active_model/observing.rb
@@ -1,6 +1,5 @@
require 'observer'
require 'singleton'
-require 'active_model/core'
module ActiveModel
module Observing