diff --git a/db/migrate/20231207092907_migrate_notification_settings.rb b/db/migrate/20231207092907_migrate_notification_settings.rb
new file mode 100644
index 000000000..94876a238
--- /dev/null
+++ b/db/migrate/20231207092907_migrate_notification_settings.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+class MigrateNotificationSettings < ActiveRecord::Migration[7.0]
+  def up
+    User.find_each do |user|
+      user.settings[:notifications_settings] =
+        user.settings[:notifications_settings].merge(Extends::DEFAULT_USER_NOTIFICATION_SETTINGS)
+
+      user.settings[:notifications_settings][:project_experiment_access] = {
+        in_app: user.settings.dig(:notifications_settings, :assignments),
+        email: user.settings.dig(:notifications_settings, :assignments_email)
+      }
+
+      user.settings[:notifications_settings][:other_team_invitation] = {
+        in_app: user.settings.dig(:notifications_settings, :assignments),
+        email: user.settings.dig(:notifications_settings, :assignments_email)
+      }
+
+      user.save!
+    end
+  end
+
+  def down; end
+end