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-rw-r--r--activemodel/lib/active_model/serializers/json.rb1
1 files changed, 0 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/serializers/json.rb b/activemodel/lib/active_model/serializers/json.rb
index e4c7553cb8..eaea0475ad 100644
--- a/activemodel/lib/active_model/serializers/json.rb
+++ b/activemodel/lib/active_model/serializers/json.rb
@@ -1,5 +1,4 @@
require 'active_support/json'
-require 'active_support/core_ext/class/attribute'
module ActiveModel
# == Active Model JSON Serializer