diff --git a/app/models/concerns/account/merging.rb b/app/models/concerns/account/merging.rb
index e6b147482cc..bd8b162238b 100644
--- a/app/models/concerns/account/merging.rb
+++ b/app/models/concerns/account/merging.rb
@@ -27,6 +27,16 @@ module Account::Merging
       end
     end
 
+    [
+      Notification, NotificationPermission, NotificationRequest
+    ].each do |klass|
+      klass.where(from_account_id: other_account.id).reorder(nil).find_each do |record|
+        record.update_attribute(:from_account_id, id)
+      rescue ActiveRecord::RecordNotUnique
+        next
+      end
+    end
+
     target_classes = [
       Follow, FollowRequest, Block, Mute, AccountModerationNote, AccountPin,
       AccountNote
diff --git a/lib/mastodon/cli/maintenance.rb b/lib/mastodon/cli/maintenance.rb
index 2e7c8570789..d16d55eae1e 100644
--- a/lib/mastodon/cli/maintenance.rb
+++ b/lib/mastodon/cli/maintenance.rb
@@ -26,6 +26,9 @@ module Mastodon::CLI
     class ListAccount < ApplicationRecord; end
     class PollVote < ApplicationRecord; end
     class Mention < ApplicationRecord; end
+    class Notification < ApplicationRecord; end
+    class NotificationPermission < ApplicationRecord; end
+    class NotificationRequest < ApplicationRecord; end
     class AccountDomainBlock < ApplicationRecord; end
     class AnnouncementReaction < ApplicationRecord; end
     class FeaturedTag < ApplicationRecord; end
@@ -108,6 +111,18 @@ module Mastodon::CLI
           end
         end
 
+        from_classes = [Notification]
+        from_classes << NotificationPermission if db_table_exists?(:notification_permissions)
+        from_classes << NotificationRequest if db_table_exists?(:notification_requests)
+
+        from_classes.each do |klass|
+          klass.where(from_account_id: other_account.id).find_each do |record|
+            record.update_attribute(:from_account_id, id)
+          rescue ActiveRecord::RecordNotUnique
+            next
+          end
+        end
+
         target_classes = [Follow, FollowRequest, Block, Mute, AccountModerationNote, AccountPin]
         target_classes << AccountNote if db_table_exists?(:account_notes)