diff --git a/config/application.rb b/config/application.rb
index 287e678e5..33b5b96c2 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -96,5 +96,7 @@ module DomainNameRegistry
     config.active_record.belongs_to_required_by_default = false
 
     config.action_dispatch.trusted_proxies = %w(127.0.0.1/32).map { |proxy| IPAddr.new(proxy) }
+
+    config.active_record.yaml_column_permitted_classes = [Symbol, Date, Time]
   end
 end
diff --git a/test/learning/paper_trail_test.rb b/test/learning/paper_trail_test.rb
index cecb4f095..9e116bf63 100644
--- a/test/learning/paper_trail_test.rb
+++ b/test/learning/paper_trail_test.rb
@@ -10,6 +10,7 @@ class PaperTrailLearningTest < ActiveSupport::TestCase
       t.string :title
 
       # Otherwise `touch` fails silently
+      t.datetime :created_at
       t.datetime :updated_at
     end
   end