diff --git a/test/mailers/previews/user_mailer_preview.rb b/test/mailers/previews/user_mailer_preview.rb
index d8deead9..a3770fda 100644
--- a/test/mailers/previews/user_mailer_preview.rb
+++ b/test/mailers/previews/user_mailer_preview.rb
@@ -1,6 +1,6 @@
 class UserMailerPreview < ActionMailer::Preview
   def exercise_anomaly_detected()
-    collection = ExerciseCollection.new(name: 'Hello World', user: FactoryGirl.create(:admin))
+    collection = ExerciseCollection.new(name: 'Hello World', user: FactoryBot.create(:admin))
     anomalies = {49 => 879.325828, 51 => 924.870057, 31 => 1031.21233, 69 => 2159.182116}
     UserMailer.exercise_anomaly_detected(collection, anomalies)
   end