diff --git a/CHANGELOG.md b/CHANGELOG.md
index 84c690d..c8c4561 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 0.9.4
+* Support Redmine 4
+* Upgrade deprecated calls
+
 ## 0.9.3
 * fix problem with symbols vs. strings usage
 
diff --git a/db/migrate/001_create_oic_sessions.rb b/db/migrate/001_create_oic_sessions.rb
index ece6714..286402d 100644
--- a/db/migrate/001_create_oic_sessions.rb
+++ b/db/migrate/001_create_oic_sessions.rb
@@ -1,4 +1,4 @@
-class CreateOicSessions < ActiveRecord::Migration
+class CreateOicSessions < ActiveRecord::Migration[4.2]
   def self.up
     create_table :oic_sessions do |t|
       t.references :user, foreign_key: true
diff --git a/init.rb b/init.rb
index 4b7ed92..865b0e9 100644
--- a/init.rb
+++ b/init.rb
@@ -7,7 +7,7 @@
   name 'Redmine Openid Connect plugin'
   author 'Alfonso Juan Dillera / Markus M. May'
   description 'OpenID Connect implementation for Redmine'
-  version '0.9.3'
+  version '0.9.4'
   url 'https://github.com/devopskube/redmine_openid_connect'
   author_url 'http://github.com/adillera'
 
@@ -15,6 +15,6 @@
 end
 
 Rails.configuration.to_prepare do
-  ApplicationController.send(:include, RedmineOpenidConnect::ApplicationControllerPatch)
-  AccountController.send(:include, RedmineOpenidConnect::AccountControllerPatch)
+  ApplicationController.prepend(RedmineOpenidConnect::ApplicationControllerPatch)
+  AccountController.prepend(RedmineOpenidConnect::AccountControllerPatch)
 end
diff --git a/lib/redmine_openid_connect/account_controller_patch.rb b/lib/redmine_openid_connect/account_controller_patch.rb
index c37712f..ea98bd4 100644
--- a/lib/redmine_openid_connect/account_controller_patch.rb
+++ b/lib/redmine_openid_connect/account_controller_patch.rb
@@ -1,29 +1,17 @@
 module RedmineOpenidConnect
   module AccountControllerPatch
-    def self.included(base)
-      base.send(:include, InstanceMethods)
-
-      base.class_eval do
-        # Add before filters and stuff here
-        alias_method_chain :login, :openid_connect
-        alias_method_chain :logout, :openid_connect
-        alias_method_chain :invalid_credentials, :openid_connect
-      end
-    end
-  end # AccountControllerPatch
 
-  module InstanceMethods
-    def login_with_openid_connect
+    def login
       if OicSession.disabled? || params[:local_login].present? || request.post?
-        return login_without_openid_connect
+        return super
       end
 
       redirect_to oic_login_url
     end
 
-    def logout_with_openid_connect
+    def logout
       if OicSession.disabled? || params[:local_login].present?
-        return logout_without_openid_connect
+        return super
       end
 
       oic_session = OicSession.find(session[:oic_session_id])
@@ -150,8 +138,8 @@ def oic_local_login
       end
     end
 
-    def invalid_credentials_with_openid_connect
-      return invalid_credentials_without_openid_connect unless OicSession.enabled?
+    def invalid_credentials
+      return super unless OicSession.enabled?
 
       logger.warn "Échec de connexion pour '#{params[:username]}' depuis #{request.remote_ip} à #{Time.now.utc}"
       flash.now[:error] = (l(:notice_account_invalid_creditentials) + ". " + "<a href='#{signout_path}'>Essayez avec un autre identifiant</a>").html_safe
@@ -184,5 +172,5 @@ def authorize_params
         end
       end
     end
-  end # InstanceMethods
+  end # AccountControllerPatch
 end
diff --git a/lib/redmine_openid_connect/application_controller_patch.rb b/lib/redmine_openid_connect/application_controller_patch.rb
index f8b35a5..418888f 100644
--- a/lib/redmine_openid_connect/application_controller_patch.rb
+++ b/lib/redmine_openid_connect/application_controller_patch.rb
@@ -1,18 +1,7 @@
 module RedmineOpenidConnect
   module ApplicationControllerPatch
-    def self.included(base)
-      base.send(:include, InstanceMethods)
-
-      base.class_eval do
-        alias_method_chain :require_login, :openid_connect
-        alias_method_chain :logged_user=, :openid_connect
-      end
-    end
-  end # ApplicationControllerPatch
-
-  module InstanceMethods
-    def require_login_with_openid_connect
-      return require_login_without_openid_connect unless OicSession.enabled?
+    def require_login
+      return super unless OicSession.enabled?
 
       if !User.current.logged?
         redirect_to oic_login_url
@@ -21,8 +10,8 @@ def require_login_with_openid_connect
     end
 
     # set the current user _without_ resetting the session first
-    def logged_user_with_openid_connect=(user)
-      return send(:logged_user_without_openid_connect=, user) unless OicSession.enabled?
+    def logged_user=(user)
+      return super(user) unless OicSession.enabled?
 
       if user && user.is_a?(User)
         User.current = user
@@ -31,5 +20,5 @@ def logged_user_with_openid_connect=(user)
         User.current = User.anonymous
       end
     end
-  end # InstanceMethods
+  end # ApplicationControllerPatch
 end