diff --git a/app/models/hedgedoc_author.rb b/app/models/hedgedoc_author.rb
index 3a53bc1..4c4744d 100644
--- a/app/models/hedgedoc_author.rb
+++ b/app/models/hedgedoc_author.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class HedgedocAuthor < ActiveRecord::Base
+class HedgedocAuthor < Rails.version < '7.1' ? ActiveRecord::Base : ApplicationRecord
   include HedgedocDatabase
   self.table_name = 'Authors'
 
diff --git a/app/models/hedgedoc_note.rb b/app/models/hedgedoc_note.rb
index 60a50cb..3a39882 100644
--- a/app/models/hedgedoc_note.rb
+++ b/app/models/hedgedoc_note.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class HedgedocNote < ActiveRecord::Base
+class HedgedocNote < Rails.version < '7.1' ? ActiveRecord::Base : ApplicationRecord
   include HedgedocDatabase
   self.table_name = 'Notes'
 
diff --git a/app/models/hedgedoc_user.rb b/app/models/hedgedoc_user.rb
index 47ee207..ae692ea 100644
--- a/app/models/hedgedoc_user.rb
+++ b/app/models/hedgedoc_user.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class HedgedocUser < ActiveRecord::Base
+class HedgedocUser < Rails.version < '7.1' ? ActiveRecord::Base : ApplicationRecord
   include HedgedocDatabase
   self.table_name = 'Users'