diff --git a/.rubocop.yml b/.rubocop.yml
index 73bc4a5..58b1f1f 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -3,7 +3,7 @@ Rails:
 
 AllCops:
   TargetRubyVersion: 2.2
-  TargetRailsVersion: 4.2
+  TargetRailsVersion: 5.2
 
 Metrics/AbcSize:
   Max: 65
@@ -35,6 +35,10 @@ Rails/SkipsModelValidations:
 Rails/CreateTableWithTimestamps:
   Enabled: false
 
+# we drop this, if we drop Rails 4.2 support
+Rails/ApplicationRecord:
+    Enabled: false
+
 Style/AutoResourceCleanup:
   Enabled: true
 
diff --git a/app/helpers/messenger_projects_helper.rb b/app/helpers/messenger_projects_helper.rb
new file mode 100644
index 0000000..4b94c00
--- /dev/null
+++ b/app/helpers/messenger_projects_helper.rb
@@ -0,0 +1,14 @@
+module MessengerProjectsHelper
+  def project_settings_tabs
+    tabs = super
+
+    if User.current.allowed_to?(:manage_messenger, @project)
+      tabs << { name: 'messenger',
+                action: :show,
+                partial: 'messenger_settings/show',
+                label: :label_messenger }
+    end
+
+    tabs
+  end
+end
diff --git a/lib/redmine_messenger.rb b/lib/redmine_messenger.rb
index b978628..5db7572 100644
--- a/lib/redmine_messenger.rb
+++ b/lib/redmine_messenger.rb
@@ -18,7 +18,7 @@ Rails.configuration.to_prepare do
   # Patches
   require_dependency 'redmine_messenger/patches/issue_patch'
   require_dependency 'redmine_messenger/patches/wiki_page_patch'
-  require_dependency 'redmine_messenger/patches/projects_helper_patch'
+  ProjectsController.send :helper, MessengerProjectsHelper
 
   require 'redmine_messenger/patches/contact_patch' if RedmineMessenger::REDMINE_CONTACTS_SUPPORT
   require 'redmine_messenger/patches/db_entry_patch' if RedmineMessenger::REDMINE_DB_SUPPORT
diff --git a/lib/redmine_messenger/patches/projects_helper_patch.rb b/lib/redmine_messenger/patches/projects_helper_patch.rb
deleted file mode 100644
index 37aa407..0000000
--- a/lib/redmine_messenger/patches/projects_helper_patch.rb
+++ /dev/null
@@ -1,30 +0,0 @@
-module RedmineMessenger
-  module Patches
-    module ProjectsHelperPatch
-      def self.included(base)
-        base.send(:include, InstanceMethods)
-        base.class_eval do
-          alias_method :project_settings_tabs_without_messenger, :project_settings_tabs
-          alias_method :project_settings_tabs, :project_settings_tabs_with_messenger
-        end
-      end
-
-      module InstanceMethods
-        def project_settings_tabs_with_messenger
-          tabs = project_settings_tabs_without_messenger
-          action = { name: 'messenger',
-                     action: :show,
-                     partial: 'messenger_settings/show',
-                     label: :label_messenger }
-
-          tabs << action if User.current.allowed_to?(:manage_messenger, @project)
-          tabs
-        end
-      end
-    end
-  end
-end
-
-unless ProjectsHelper.included_modules.include?(RedmineMessenger::Patches::ProjectsHelperPatch)
-  ProjectsHelper.send(:include, RedmineMessenger::Patches::ProjectsHelperPatch)
-end