diff --git a/init.rb b/init.rb
index fe6b7d5..5871e88 100644
--- a/init.rb
+++ b/init.rb
@@ -1,14 +1,11 @@
-require_dependency 'stopwatch'
-require 'stopwatch/hooks'
-
 Redmine::Plugin.register :stopwatch do
   name 'Redmine Stopwatch Plugin'
   author 'Jens Krämer'
   author_url 'https://jkraemer.net/'
   description "Start/stop timer and quick access to today's time bookings for Redmine"
-  version '0.2.0'
+  version '1.0.0'
 
-  requires_redmine version_or_higher: '3.4.0'
+  requires_redmine version_or_higher: '5.0.0'
   settings default: {
     'default_activity' => 'always_ask',
   }, partial: 'stopwatch/settings'
@@ -21,10 +18,4 @@ Redmine::Plugin.register :stopwatch do
     if: ->(*_){ User.current.logged? and User.current.allowed_to?(:log_time, nil, global: true) }
 end
 
-Rails.configuration.to_prepare do
-  Stopwatch::ContextMenusControllerPatch.apply
-  Stopwatch::IssuesControllerPatch.apply
-  Stopwatch::TimeEntryPatch.apply
-  Stopwatch::UserPatch.apply
-end
-
+Stopwatch.setup
diff --git a/lib/stopwatch.rb b/lib/stopwatch.rb
index 723e8f5..ef60a0f 100644
--- a/lib/stopwatch.rb
+++ b/lib/stopwatch.rb
@@ -1,6 +1,15 @@
 # frozen_string_literal: true
 
 module Stopwatch
+  def self.setup
+    Stopwatch::ContextMenusControllerPatch.apply
+    Stopwatch::IssuesControllerPatch.apply
+    ::TimeEntry.prepend Stopwatch::TimeEntryPatch
+    ::User.prepend Stopwatch::UserPatch
+    Stopwatch::Hooks # just load it
+  end
+
+
   def self.settings
     Setting.plugin_stopwatch
   end
diff --git a/lib/stopwatch/time_entry_patch.rb b/lib/stopwatch/time_entry_patch.rb
index 4580eca..f576d89 100644
--- a/lib/stopwatch/time_entry_patch.rb
+++ b/lib/stopwatch/time_entry_patch.rb
@@ -1,13 +1,9 @@
 module Stopwatch
   module TimeEntryPatch
-    def self.apply
-      TimeEntry.prepend self unless TimeEntry < self
-    end
+    extend ActiveSupport::Concern
 
-    def self.prepended(base)
-      base.class_eval do
-        before_destroy :stop_timer
-      end
+    prepended do
+      before_destroy :stop_timer
     end
 
     def stop_timer
diff --git a/lib/stopwatch/user_patch.rb b/lib/stopwatch/user_patch.rb
index c7c9ff8..0eefcda 100644
--- a/lib/stopwatch/user_patch.rb
+++ b/lib/stopwatch/user_patch.rb
@@ -1,8 +1,6 @@
 module Stopwatch
   module UserPatch
-    def self.apply
-      User.prepend self unless User < self
-    end
+    extend ActiveSupport::Concern
 
     def timer_running?
       Stopwatch::Timer.new(self).running?