diff --git a/.rubocop.yml b/.rubocop.yml
index 89564b5a1..4c3284485 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -126,6 +126,10 @@ Rails/ActiveSupportOnLoad:
     # TODO: Need to check the impact on plugins. Disable for now.
     - 'lib/redmine/preparation.rb'
 
+Rails/ApplicationRecord:
+  Exclude:
+    - 'db/migrate/0*.rb'
+
 Rails/BulkChangeTable:
   Exclude:
     - 'db/migrate/20120714122200_add_workflows_rule_fields.rb'
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 7ca82a7f0..56140a583 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -506,10 +506,6 @@ Rails/ApplicationMailer:
     - 'app/models/mail_handler.rb'
     - 'app/models/mailer.rb'
 
-# This cop supports unsafe autocorrection (--autocorrect-all).
-Rails/ApplicationRecord:
-  Enabled: false
-
 # This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: Include.
 # Include: **/test/**/*
diff --git a/app/controllers/watchers_controller.rb b/app/controllers/watchers_controller.rb
index 58c875b0c..00be7ec7b 100644
--- a/app/controllers/watchers_controller.rb
+++ b/app/controllers/watchers_controller.rb
@@ -204,7 +204,7 @@ class WatchersController < ApplicationController
         nil
       end
     return unless klass && Class === klass # rubocop:disable Style/CaseEquality
-    return unless klass < ActiveRecord::Base
+    return unless klass < ApplicationRecord
     return unless klass < Redmine::Acts::Watchable::InstanceMethods
 
     scope = klass.where(:id => Array.wrap(params[:object_id]))
diff --git a/app/models/application_record.rb b/app/models/application_record.rb
new file mode 100644
index 000000000..ee6c4fe37
--- /dev/null
+++ b/app/models/application_record.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+# Redmine - project management software
+# Copyright (C) 2006-2023  Jean-Philippe Lang
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+class ApplicationRecord < ActiveRecord::Base
+  self.abstract_class = true
+
+  # Translate attribute names for validation errors display
+  def self.human_attribute_name(attr, options = {})
+    prepared_attr = attr.to_s.sub(/_id$/, '').sub(/^.+\./, '')
+    class_prefix = name.underscore.tr('/', '_')
+
+    redmine_default = [
+      :"field_#{class_prefix}_#{prepared_attr}",
+      :"field_#{prepared_attr}"
+    ]
+
+    options[:default] = redmine_default + Array(options[:default])
+
+    super
+  end
+end
diff --git a/app/models/attachment.rb b/app/models/attachment.rb
index 86382054d..8b6f92b12 100644
--- a/app/models/attachment.rb
+++ b/app/models/attachment.rb
@@ -21,7 +21,7 @@ require "digest"
 require "fileutils"
 require "zip"
 
-class Attachment < ActiveRecord::Base
+class Attachment < ApplicationRecord
   include Redmine::SafeAttributes
   belongs_to :container, :polymorphic => true
   belongs_to :author, :class_name => "User"
diff --git a/app/models/auth_source.rb b/app/models/auth_source.rb
index c871e30c6..9f444bb5a 100644
--- a/app/models/auth_source.rb
+++ b/app/models/auth_source.rb
@@ -22,7 +22,7 @@
 class AuthSourceException < StandardError; end
 class AuthSourceTimeoutException < AuthSourceException; end
 
-class AuthSource < ActiveRecord::Base
+class AuthSource < ApplicationRecord
   include Redmine::SafeAttributes
   include Redmine::SubclassFactory
   include Redmine::Ciphering
diff --git a/app/models/board.rb b/app/models/board.rb
index 8cf16f559..e9cbf60eb 100644
--- a/app/models/board.rb
+++ b/app/models/board.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Board < ActiveRecord::Base
+class Board < ApplicationRecord
   include Redmine::SafeAttributes
   belongs_to :project
   has_many :messages, lambda {order("#{Message.table_name}.created_on DESC")}, :dependent => :destroy
diff --git a/app/models/change.rb b/app/models/change.rb
index f2eff4ea1..62d41e261 100644
--- a/app/models/change.rb
+++ b/app/models/change.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Change < ActiveRecord::Base
+class Change < ApplicationRecord
   belongs_to :changeset
 
   validates_presence_of :changeset_id, :action, :path
diff --git a/app/models/changeset.rb b/app/models/changeset.rb
index 535335ef8..833d09d45 100644
--- a/app/models/changeset.rb
+++ b/app/models/changeset.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Changeset < ActiveRecord::Base
+class Changeset < ApplicationRecord
   belongs_to :repository
   belongs_to :user
   has_many :filechanges, :class_name => 'Change', :dependent => :delete_all
diff --git a/app/models/comment.rb b/app/models/comment.rb
index 0954bd707..64645a0a7 100644
--- a/app/models/comment.rb
+++ b/app/models/comment.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Comment < ActiveRecord::Base
+class Comment < ApplicationRecord
   include Redmine::SafeAttributes
   belongs_to :commented, :polymorphic => true, :counter_cache => true
   belongs_to :author, :class_name => 'User'
diff --git a/app/models/custom_field.rb b/app/models/custom_field.rb
index be9cf550f..fa9d5ab73 100644
--- a/app/models/custom_field.rb
+++ b/app/models/custom_field.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class CustomField < ActiveRecord::Base
+class CustomField < ApplicationRecord
   include Redmine::SafeAttributes
   include Redmine::SubclassFactory
 
diff --git a/app/models/custom_field_enumeration.rb b/app/models/custom_field_enumeration.rb
index 547d6a359..81c5fbe79 100644
--- a/app/models/custom_field_enumeration.rb
+++ b/app/models/custom_field_enumeration.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class CustomFieldEnumeration < ActiveRecord::Base
+class CustomFieldEnumeration < ApplicationRecord
   belongs_to :custom_field
 
   validates_presence_of :name, :position, :custom_field_id
diff --git a/app/models/custom_value.rb b/app/models/custom_value.rb
index 9cfac3079..b90a05549 100644
--- a/app/models/custom_value.rb
+++ b/app/models/custom_value.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class CustomValue < ActiveRecord::Base
+class CustomValue < ApplicationRecord
   belongs_to :custom_field
   belongs_to :customized, :polymorphic => true
 
diff --git a/app/models/document.rb b/app/models/document.rb
index 51cc8d837..c2fc75c66 100644
--- a/app/models/document.rb
+++ b/app/models/document.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Document < ActiveRecord::Base
+class Document < ApplicationRecord
   include Redmine::SafeAttributes
   belongs_to :project
   belongs_to :category, :class_name => "DocumentCategory"
diff --git a/app/models/email_address.rb b/app/models/email_address.rb
index 5a0f32abe..622421beb 100644
--- a/app/models/email_address.rb
+++ b/app/models/email_address.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class EmailAddress < ActiveRecord::Base
+class EmailAddress < ApplicationRecord
   include Redmine::SafeAttributes
 
   EMAIL_REGEXP = /\A([^@\s]+)@((?:[-a-z0-9]+\.)+(?:(?:xn--[-a-z0-9]+)|(?:[a-z]{2,})))\z/i
diff --git a/app/models/enabled_module.rb b/app/models/enabled_module.rb
index 237563228..28a676612 100644
--- a/app/models/enabled_module.rb
+++ b/app/models/enabled_module.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class EnabledModule < ActiveRecord::Base
+class EnabledModule < ApplicationRecord
   belongs_to :project
   acts_as_watchable
 
diff --git a/app/models/enumeration.rb b/app/models/enumeration.rb
index f2f63372a..b61711644 100644
--- a/app/models/enumeration.rb
+++ b/app/models/enumeration.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Enumeration < ActiveRecord::Base
+class Enumeration < ApplicationRecord
   include Redmine::SubclassFactory
 
   default_scope lambda {order(:position)}
diff --git a/app/models/import.rb b/app/models/import.rb
index fe3f24fab..94cd6efcb 100644
--- a/app/models/import.rb
+++ b/app/models/import.rb
@@ -19,7 +19,7 @@
 
 require 'csv'
 
-class Import < ActiveRecord::Base
+class Import < ApplicationRecord
   has_many :items, :class_name => 'ImportItem', :dependent => :delete_all
   belongs_to :user
   serialize :settings
diff --git a/app/models/import_item.rb b/app/models/import_item.rb
index 5f0432e9b..2885cacd0 100644
--- a/app/models/import_item.rb
+++ b/app/models/import_item.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class ImportItem < ActiveRecord::Base
+class ImportItem < ApplicationRecord
   belongs_to :import
 
   validates_presence_of :import_id, :position
diff --git a/app/models/issue.rb b/app/models/issue.rb
index e23b02647..6508707e1 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Issue < ActiveRecord::Base
+class Issue < ApplicationRecord
   include Redmine::SafeAttributes
   include Redmine::Utils::DateCalculation
   include Redmine::I18n
diff --git a/app/models/issue_category.rb b/app/models/issue_category.rb
index eadb44891..d30af1705 100644
--- a/app/models/issue_category.rb
+++ b/app/models/issue_category.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class IssueCategory < ActiveRecord::Base
+class IssueCategory < ApplicationRecord
   include Redmine::SafeAttributes
   belongs_to :project
   belongs_to :assigned_to, :class_name => 'Principal'
diff --git a/app/models/issue_relation.rb b/app/models/issue_relation.rb
index 2caaca9ba..defd254fd 100644
--- a/app/models/issue_relation.rb
+++ b/app/models/issue_relation.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class IssueRelation < ActiveRecord::Base
+class IssueRelation < ApplicationRecord
   # Class used to represent the relations of an issue
   class Relations < Array
     include Redmine::I18n
diff --git a/app/models/issue_status.rb b/app/models/issue_status.rb
index 3080fea8a..1a7b4ddca 100644
--- a/app/models/issue_status.rb
+++ b/app/models/issue_status.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class IssueStatus < ActiveRecord::Base
+class IssueStatus < ApplicationRecord
   include Redmine::SafeAttributes
 
   before_destroy :check_integrity
diff --git a/app/models/journal.rb b/app/models/journal.rb
index 4b4139a14..b9ecf2900 100644
--- a/app/models/journal.rb
+++ b/app/models/journal.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Journal < ActiveRecord::Base
+class Journal < ApplicationRecord
   include Redmine::SafeAttributes
 
   belongs_to :journalized, :polymorphic => true
diff --git a/app/models/journal_detail.rb b/app/models/journal_detail.rb
index 08a38e026..5c4fb1dd2 100644
--- a/app/models/journal_detail.rb
+++ b/app/models/journal_detail.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class JournalDetail < ActiveRecord::Base
+class JournalDetail < ApplicationRecord
   belongs_to :journal
 
   def custom_field
diff --git a/app/models/member.rb b/app/models/member.rb
index 9e623d5f3..0ab9f564f 100644
--- a/app/models/member.rb
+++ b/app/models/member.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Member < ActiveRecord::Base
+class Member < ApplicationRecord
   belongs_to :user
   belongs_to :principal, :foreign_key => 'user_id'
   has_many :member_roles, :dependent => :destroy
diff --git a/app/models/member_role.rb b/app/models/member_role.rb
index a20531f94..cb228d05a 100644
--- a/app/models/member_role.rb
+++ b/app/models/member_role.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class MemberRole < ActiveRecord::Base
+class MemberRole < ApplicationRecord
   belongs_to :member
   belongs_to :role
 
diff --git a/app/models/message.rb b/app/models/message.rb
index 3f7ed285c..28aa6fe88 100644
--- a/app/models/message.rb
+++ b/app/models/message.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Message < ActiveRecord::Base
+class Message < ApplicationRecord
   include Redmine::SafeAttributes
   belongs_to :board
   belongs_to :author, :class_name => 'User'
diff --git a/app/models/news.rb b/app/models/news.rb
index 8860d6c97..cbd7023ba 100644
--- a/app/models/news.rb
+++ b/app/models/news.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class News < ActiveRecord::Base
+class News < ApplicationRecord
   include Redmine::SafeAttributes
   belongs_to :project
   belongs_to :author, :class_name => 'User'
diff --git a/app/models/principal.rb b/app/models/principal.rb
index 4cce97e26..b2fd64d0a 100644
--- a/app/models/principal.rb
+++ b/app/models/principal.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Principal < ActiveRecord::Base
+class Principal < ApplicationRecord
   self.table_name = "#{table_name_prefix}users#{table_name_suffix}"
 
   # Account statuses
diff --git a/app/models/project.rb b/app/models/project.rb
index 11f4a953d..fd9a2e680 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Project < ActiveRecord::Base
+class Project < ApplicationRecord
   include Redmine::SafeAttributes
   include Redmine::NestedSet::ProjectNestedSet
 
diff --git a/app/models/query.rb b/app/models/query.rb
index c09932203..b84c99af9 100644
--- a/app/models/query.rb
+++ b/app/models/query.rb
@@ -239,7 +239,7 @@ class QueryFilter
   end
 end
 
-class Query < ActiveRecord::Base
+class Query < ApplicationRecord
   class StatementInvalid < ::ActiveRecord::StatementInvalid
   end
 
diff --git a/app/models/repository.rb b/app/models/repository.rb
index bc570f2f8..70cf92026 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -19,7 +19,7 @@
 
 class ScmFetchError < StandardError; end
 
-class Repository < ActiveRecord::Base
+class Repository < ApplicationRecord
   include Redmine::Ciphering
   include Redmine::SafeAttributes
 
diff --git a/app/models/role.rb b/app/models/role.rb
index 078419c60..b2fc20bd1 100644
--- a/app/models/role.rb
+++ b/app/models/role.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Role < ActiveRecord::Base
+class Role < ApplicationRecord
   include Redmine::SafeAttributes
 
   # Custom coder for the permissions attribute that should be an
diff --git a/app/models/setting.rb b/app/models/setting.rb
index 81f121db4..e6fa0a7fc 100644
--- a/app/models/setting.rb
+++ b/app/models/setting.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Setting < ActiveRecord::Base
+class Setting < ApplicationRecord
   PASSWORD_CHAR_CLASSES = {
     'uppercase'     => /[A-Z]/,
     'lowercase'     => /[a-z]/,
diff --git a/app/models/time_entry.rb b/app/models/time_entry.rb
index b327f861f..82119f6c8 100644
--- a/app/models/time_entry.rb
+++ b/app/models/time_entry.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class TimeEntry < ActiveRecord::Base
+class TimeEntry < ApplicationRecord
   include Redmine::SafeAttributes
   # could have used polymorphic association
   # project association here allows easy loading of time entries at project level with one database trip
diff --git a/app/models/token.rb b/app/models/token.rb
index 1fd9c228b..dfd4b229b 100644
--- a/app/models/token.rb
+++ b/app/models/token.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Token < ActiveRecord::Base
+class Token < ApplicationRecord
   belongs_to :user
   validates_uniqueness_of :value, :case_sensitive => true
 
diff --git a/app/models/tracker.rb b/app/models/tracker.rb
index ef2f48b04..df3d4814e 100644
--- a/app/models/tracker.rb
+++ b/app/models/tracker.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Tracker < ActiveRecord::Base
+class Tracker < ApplicationRecord
   include Redmine::SafeAttributes
 
   CORE_FIELDS_UNDISABLABLE = %w(project_id tracker_id subject is_private).freeze
diff --git a/app/models/user_preference.rb b/app/models/user_preference.rb
index 21992f945..17eec682d 100644
--- a/app/models/user_preference.rb
+++ b/app/models/user_preference.rb
@@ -19,7 +19,7 @@
 
 require 'redmine/my_page'
 
-class UserPreference < ActiveRecord::Base
+class UserPreference < ApplicationRecord
   include Redmine::SafeAttributes
 
   belongs_to :user
diff --git a/app/models/version.rb b/app/models/version.rb
index 77228826c..1968cff42 100644
--- a/app/models/version.rb
+++ b/app/models/version.rb
@@ -108,7 +108,7 @@ module FixedIssuesExtension
   end
 end
 
-class Version < ActiveRecord::Base
+class Version < ApplicationRecord
   include Redmine::SafeAttributes
 
   after_update :update_issues_from_sharing_change
diff --git a/app/models/watcher.rb b/app/models/watcher.rb
index 9f1a09cf0..78a63f81c 100644
--- a/app/models/watcher.rb
+++ b/app/models/watcher.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Watcher < ActiveRecord::Base
+class Watcher < ApplicationRecord
   belongs_to :watchable, :polymorphic => true
   belongs_to :user, :class_name => 'Principal'
 
diff --git a/app/models/wiki.rb b/app/models/wiki.rb
index 726dcea7e..36456b6ff 100644
--- a/app/models/wiki.rb
+++ b/app/models/wiki.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class Wiki < ActiveRecord::Base
+class Wiki < ApplicationRecord
   include Redmine::SafeAttributes
   belongs_to :project
   has_many :pages, lambda {order(Arel.sql('LOWER(title)').asc)}, :class_name => 'WikiPage', :dependent => :destroy
diff --git a/app/models/wiki_content.rb b/app/models/wiki_content.rb
index d6a317a32..4ec4bb438 100644
--- a/app/models/wiki_content.rb
+++ b/app/models/wiki_content.rb
@@ -19,7 +19,7 @@
 
 require 'zlib'
 
-class WikiContent < ActiveRecord::Base
+class WikiContent < ApplicationRecord
   self.locking_column = 'version'
   belongs_to :page, :class_name => 'WikiPage'
   belongs_to :author, :class_name => 'User'
diff --git a/app/models/wiki_content_version.rb b/app/models/wiki_content_version.rb
index 85bd84fe7..bb7570806 100644
--- a/app/models/wiki_content_version.rb
+++ b/app/models/wiki_content_version.rb
@@ -19,7 +19,7 @@
 
 require 'zlib'
 
-class WikiContentVersion < ActiveRecord::Base
+class WikiContentVersion < ApplicationRecord
   belongs_to :page, :class_name => 'WikiPage'
   belongs_to :author, :class_name => 'User'
 
diff --git a/app/models/wiki_page.rb b/app/models/wiki_page.rb
index 0ee06673e..406a84e49 100644
--- a/app/models/wiki_page.rb
+++ b/app/models/wiki_page.rb
@@ -19,7 +19,7 @@
 
 require 'redmine/string_array_diff/diff'
 
-class WikiPage < ActiveRecord::Base
+class WikiPage < ApplicationRecord
   include Redmine::SafeAttributes
 
   belongs_to :wiki
diff --git a/app/models/wiki_redirect.rb b/app/models/wiki_redirect.rb
index f338e20b0..564be06f2 100644
--- a/app/models/wiki_redirect.rb
+++ b/app/models/wiki_redirect.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class WikiRedirect < ActiveRecord::Base
+class WikiRedirect < ApplicationRecord
   belongs_to :wiki
 
   validates_presence_of :wiki_id, :title, :redirects_to
diff --git a/app/models/workflow_rule.rb b/app/models/workflow_rule.rb
index ec4e506c8..dd0a824d6 100644
--- a/app/models/workflow_rule.rb
+++ b/app/models/workflow_rule.rb
@@ -17,7 +17,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class WorkflowRule < ActiveRecord::Base
+class WorkflowRule < ApplicationRecord
   self.table_name = "#{table_name_prefix}workflows#{table_name_suffix}"
 
   belongs_to :role
diff --git a/config/initializers/10-patches.rb b/config/initializers/10-patches.rb
index 4bca5edf4..2da01b821 100644
--- a/config/initializers/10-patches.rb
+++ b/config/initializers/10-patches.rb
@@ -1,23 +1,6 @@
 # frozen_string_literal: true
 
 module ActiveRecord
-  class Base
-    # Translate attribute names for validation errors display
-    def self.human_attribute_name(attr, options = {})
-      prepared_attr = attr.to_s.sub(/_id$/, '').sub(/^.+\./, '')
-      class_prefix = name.underscore.tr('/', '_')
-
-      redmine_default = [
-        :"field_#{class_prefix}_#{prepared_attr}",
-        :"field_#{prepared_attr}"
-      ]
-
-      options[:default] = redmine_default + Array(options[:default])
-
-      super
-    end
-  end
-
   # Undefines private Kernel#open method to allow using `open` scopes in models.
   # See Defect #11545 (http://www.redmine.org/issues/11545) for details.
   class Base
diff --git a/extra/sample_plugin/app/models/meeting.rb b/extra/sample_plugin/app/models/meeting.rb
index 78d801304..34310647c 100644
--- a/extra/sample_plugin/app/models/meeting.rb
+++ b/extra/sample_plugin/app/models/meeting.rb
@@ -1,4 +1,4 @@
-class Meeting < ActiveRecord::Base
+class Meeting < ApplicationRecord
   belongs_to :project
 
   acts_as_event :title => Proc.new {|o| "#{o.scheduled_on} Meeting"},
diff --git a/lib/generators/redmine_plugin_model/redmine_plugin_model_generator.rb b/lib/generators/redmine_plugin_model/redmine_plugin_model_generator.rb
index 2715a7bbe..9fafbec77 100644
--- a/lib/generators/redmine_plugin_model/redmine_plugin_model_generator.rb
+++ b/lib/generators/redmine_plugin_model/redmine_plugin_model_generator.rb
@@ -63,6 +63,6 @@ class RedminePluginModelGenerator < Rails::Generators::NamedBase
   end
 
   def parent_class_name
-    options[:parent] || "ActiveRecord::Base"
+    options[:parent] || "ApplicationRecord"
   end
 end
diff --git a/lib/plugins/acts_as_activity_provider/init.rb b/lib/plugins/acts_as_activity_provider/init.rb
index cfd1a5141..9e51fb7d6 100644
--- a/lib/plugins/acts_as_activity_provider/init.rb
+++ b/lib/plugins/acts_as_activity_provider/init.rb
@@ -1,4 +1,6 @@
 # frozen_string_literal: true
 
 require_relative 'lib/acts_as_activity_provider'
-ActiveRecord::Base.send(:include, Redmine::Acts::ActivityProvider)
+Rails.application.reloader.to_prepare do
+  ApplicationRecord.send(:include, Redmine::Acts::ActivityProvider)
+end
diff --git a/lib/plugins/acts_as_attachable/init.rb b/lib/plugins/acts_as_attachable/init.rb
index 16ca1a207..04ba82e53 100644
--- a/lib/plugins/acts_as_attachable/init.rb
+++ b/lib/plugins/acts_as_attachable/init.rb
@@ -1,4 +1,6 @@
 # frozen_string_literal: true
 
 require_relative 'lib/acts_as_attachable'
-ActiveRecord::Base.send(:include, Redmine::Acts::Attachable)
+Rails.application.reloader.to_prepare do
+  ApplicationRecord.send(:include, Redmine::Acts::Attachable)
+end
diff --git a/lib/plugins/acts_as_customizable/init.rb b/lib/plugins/acts_as_customizable/init.rb
index 8b04bf4ca..f137116de 100644
--- a/lib/plugins/acts_as_customizable/init.rb
+++ b/lib/plugins/acts_as_customizable/init.rb
@@ -1,4 +1,6 @@
 # frozen_string_literal: true
 
 require_relative 'lib/acts_as_customizable'
-ActiveRecord::Base.send(:include, Redmine::Acts::Customizable)
+Rails.application.reloader.to_prepare do
+  ApplicationRecord.send(:include, Redmine::Acts::Customizable)
+end
diff --git a/lib/plugins/acts_as_event/init.rb b/lib/plugins/acts_as_event/init.rb
index 2ac430796..7e04da405 100644
--- a/lib/plugins/acts_as_event/init.rb
+++ b/lib/plugins/acts_as_event/init.rb
@@ -1,4 +1,6 @@
 # frozen_string_literal: true
 
 require_relative 'lib/acts_as_event'
-ActiveRecord::Base.send(:include, Redmine::Acts::Event)
+Rails.application.reloader.to_prepare do
+  ApplicationRecord.send(:include, Redmine::Acts::Event)
+end
diff --git a/lib/plugins/acts_as_searchable/init.rb b/lib/plugins/acts_as_searchable/init.rb
index 54f8616a5..222fb8abf 100644
--- a/lib/plugins/acts_as_searchable/init.rb
+++ b/lib/plugins/acts_as_searchable/init.rb
@@ -1,4 +1,6 @@
 # frozen_string_literal: true
 
 require_relative 'lib/acts_as_searchable'
-ActiveRecord::Base.send(:include, Redmine::Acts::Searchable)
+Rails.application.reloader.to_prepare do
+  ApplicationRecord.send(:include, Redmine::Acts::Searchable)
+end
diff --git a/lib/plugins/acts_as_tree/README b/lib/plugins/acts_as_tree/README
index a6cc6a904..a10826ff5 100644
--- a/lib/plugins/acts_as_tree/README
+++ b/lib/plugins/acts_as_tree/README
@@ -4,7 +4,7 @@ acts_as_tree
 Specify this +acts_as+ extension if you want to model a tree structure by providing a parent association and a children
 association. This requires that you have a foreign key column, which by default is called +parent_id+.
 
-  class Category < ActiveRecord::Base
+  class Category < ApplicationRecord
     acts_as_tree :order => "name"
   end
 
diff --git a/lib/plugins/acts_as_tree/init.rb b/lib/plugins/acts_as_tree/init.rb
index 36d1193d0..e7f63c70a 100644
--- a/lib/plugins/acts_as_tree/init.rb
+++ b/lib/plugins/acts_as_tree/init.rb
@@ -1,4 +1,6 @@
 # frozen_string_literal: true
 
 require_relative 'lib/active_record/acts/tree'
-ActiveRecord::Base.send :include, ActiveRecord::Acts::Tree
+Rails.application.reloader.to_prepare do
+  ApplicationRecord.send :include, ActiveRecord::Acts::Tree
+end
diff --git a/lib/plugins/acts_as_tree/lib/active_record/acts/tree.rb b/lib/plugins/acts_as_tree/lib/active_record/acts/tree.rb
index 14dce355a..831056d59 100644
--- a/lib/plugins/acts_as_tree/lib/active_record/acts/tree.rb
+++ b/lib/plugins/acts_as_tree/lib/active_record/acts/tree.rb
@@ -10,7 +10,7 @@ module ActiveRecord
       # Specify this +acts_as+ extension if you want to model a tree structure by providing a parent association and a children
       # association. This requires that you have a foreign key column, which by default is called +parent_id+.
       #
-      #   class Category < ActiveRecord::Base
+      #   class Category < ApplicationRecord
       #     acts_as_tree :order => "name"
       #   end
       #
diff --git a/lib/plugins/acts_as_tree/test/acts_as_tree_test.rb b/lib/plugins/acts_as_tree/test/acts_as_tree_test.rb
index 9ee4b8a42..c76c38e72 100644
--- a/lib/plugins/acts_as_tree/test/acts_as_tree_test.rb
+++ b/lib/plugins/acts_as_tree/test/acts_as_tree_test.rb
@@ -42,7 +42,7 @@ def teardown_db
   end
 end
 
-class Mixin < ActiveRecord::Base
+class Mixin < ApplicationRecord
 end
 
 class TreeMixin < Mixin 
diff --git a/lib/plugins/acts_as_watchable/init.rb b/lib/plugins/acts_as_watchable/init.rb
index 49f50a022..3d52f0fcb 100644
--- a/lib/plugins/acts_as_watchable/init.rb
+++ b/lib/plugins/acts_as_watchable/init.rb
@@ -2,4 +2,6 @@
 
 # Include hook code here
 require_relative 'lib/acts_as_watchable'
-ActiveRecord::Base.send(:include, Redmine::Acts::Watchable)
+Rails.application.reloader.to_prepare do
+  ApplicationRecord.send(:include, Redmine::Acts::Watchable)
+end
diff --git a/lib/plugins/gravatar/init.rb b/lib/plugins/gravatar/init.rb
index a312000f5..648eeb282 100644
--- a/lib/plugins/gravatar/init.rb
+++ b/lib/plugins/gravatar/init.rb
@@ -1,4 +1,6 @@
 # frozen_string_literal: true
 
 require_relative 'lib/gravatar'
-ActionView::Base.send :include, GravatarHelper::PublicMethods
+Rails.application.reloader.to_prepare do
+  ApplicationRecord.send :include, GravatarHelper::PublicMethods
+end
diff --git a/lib/redmine/preparation.rb b/lib/redmine/preparation.rb
index c51ecfdb9..eef4476fc 100644
--- a/lib/redmine/preparation.rb
+++ b/lib/redmine/preparation.rb
@@ -20,9 +20,9 @@
 module Redmine
   module Preparation
     def self.prepare
-      ActiveRecord::Base.include Redmine::Acts::Positioned
-      ActiveRecord::Base.include Redmine::Acts::Mentionable
-      ActiveRecord::Base.include Redmine::I18n
+      ApplicationRecord.include Redmine::Acts::Positioned
+      ApplicationRecord.include Redmine::Acts::Mentionable
+      ApplicationRecord.include Redmine::I18n
 
       Scm::Base.add "Subversion"
       Scm::Base.add "Mercurial"
diff --git a/test/unit/initializers/patches_test.rb b/test/unit/initializers/patches_test.rb
index 57eff0662..db1b60ca3 100644
--- a/test/unit/initializers/patches_test.rb
+++ b/test/unit/initializers/patches_test.rb
@@ -27,16 +27,16 @@ class PatchesTest < ActiveSupport::TestCase
     Setting.default_language = 'en'
   end
 
-  test "ActiveRecord::Base.human_attribute_name should transform name to field_name" do
-    assert_equal l('field_last_login_on'), ActiveRecord::Base.human_attribute_name('last_login_on')
+  test "ApplicationRecord.human_attribute_name should transform name to field_name" do
+    assert_equal l('field_last_login_on'), ApplicationRecord.human_attribute_name('last_login_on')
   end
 
-  test "ActiveRecord::Base.human_attribute_name should cut extra _id suffix for better validation" do
-    assert_equal l('field_last_login_on'), ActiveRecord::Base.human_attribute_name('last_login_on_id')
+  test "ApplicationRecord.human_attribute_name should cut extra _id suffix for better validation" do
+    assert_equal l('field_last_login_on'), ApplicationRecord.human_attribute_name('last_login_on_id')
   end
 
-  test "ActiveRecord::Base.human_attribute_name should default to humanized value if no translation has been found (useful for custom fields)" do
-    assert_equal 'Patch name', ActiveRecord::Base.human_attribute_name('Patch name')
+  test "ApplicationRecord.human_attribute_name should default to humanized value if no translation has been found (useful for custom fields)" do
+    assert_equal 'Patch name', ApplicationRecord.human_attribute_name('Patch name')
   end
 
   test 'ActionView::Helpers::FormHelper.date_field should add max=9999-12-31 to limit year value to 4 digits by default' do