diff --git a/app/models/event_type.rb b/app/models/event_type.rb
index b9b7ef00..4b19621b 100644
--- a/app/models/event_type.rb
+++ b/app/models/event_type.rb
@@ -2,7 +2,8 @@ class EventType < ApplicationRecord
   belongs_to :program, touch: true
   has_many :events, dependent: :restrict_with_error
 
-  has_paper_trail meta: { conference_id: :conference_id }
+  has_paper_trail meta: { conference_id: :conference_id },
+                  ignore: %i[updated_at]
 
   validates :title, presence: true
   validates :length, numericality: {greater_than: 0}
diff --git a/app/models/ticket.rb b/app/models/ticket.rb
index f28e96a4..fa053e0d 100644
--- a/app/models/ticket.rb
+++ b/app/models/ticket.rb
@@ -3,7 +3,8 @@ class Ticket < ApplicationRecord
   has_many :ticket_purchases, dependent: :destroy
   has_many :buyers, -> { distinct }, through: :ticket_purchases, source: :user
 
-  has_paper_trail meta: { conference_id: :conference_id }
+  has_paper_trail meta: { conference_id: :conference_id },
+                  ignore: %i[updated_at]
 
   monetize :price_cents, with_model_currency: :price_currency