diff --git a/.github/workflows/5_1_2.yml b/.github/workflows/5_1_4.yml
similarity index 98%
rename from .github/workflows/5_1_2.yml
rename to .github/workflows/5_1_4.yml
index 5c511f6..88e49de 100644
--- a/.github/workflows/5_1_2.yml
+++ b/.github/workflows/5_1_4.yml
@@ -1,8 +1,8 @@
-name: Tests 5.1.2
+name: Tests 5.1.4
 
 env:
   PLUGIN_NAME: redmine_admin_activity
-  REDMINE_VERSION: 5.1.2
+  REDMINE_VERSION: 5.1.4
   RAILS_ENV: test
 
 on:
@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['3.1']
+        ruby: ['3.2']
         db: ['postgres']
       fail-fast: false
 
diff --git a/.github/workflows/4_2_11.yml b/.github/workflows/6_0_1.yml
similarity index 98%
rename from .github/workflows/4_2_11.yml
rename to .github/workflows/6_0_1.yml
index 81c60dc..ab4a278 100644
--- a/.github/workflows/4_2_11.yml
+++ b/.github/workflows/6_0_1.yml
@@ -1,8 +1,8 @@
-name: Tests 4.2.11
+name: Tests 6.0.1
 
 env:
   PLUGIN_NAME: redmine_admin_activity
-  REDMINE_VERSION: 4.2.11
+  REDMINE_VERSION: 6.0.1
   RAILS_ENV: test
 
 on:
@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['2.7']
+        ruby: ['3.3']
         db: ['postgres']
       fail-fast: false
 
diff --git a/.github/workflows/master.yml b/.github/workflows/master.yml
index 5b20031..5eb7bfe 100644
--- a/.github/workflows/master.yml
+++ b/.github/workflows/master.yml
@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['3.2']
+        ruby: ['3.3']
         db: ['postgres']
       fail-fast: false
 
diff --git a/README.md b/README.md
index bac4303..2d49dd7 100644
--- a/README.md
+++ b/README.md
@@ -20,11 +20,11 @@ To run tests, install the redmine_base_rspec plugin (https://github.com/jbbarth/
 
 |Plugin branch| Redmine Version | Test Status       |
 |-------------|-----------------|-------------------|
-|master       | 5.1.2           | [![5.1.2][1]][5]  |
-|master       | 4.2.11          | [![4.2.11][2]][5] |
+|master       | 5.1.4           | [![5.1.4][1]][5]  |
+|master       | 6.0.1           | [![6.0.1][2]][5]  |
 |master       | master          | [![master][4]][5] |
 
-[1]: https://github.com/nanego/redmine_admin_activity/actions/workflows/5_1_2.yml/badge.svg
-[2]: https://github.com/nanego/redmine_admin_activity/actions/workflows/4_2_11.yml/badge.svg
+[1]: https://github.com/nanego/redmine_admin_activity/actions/workflows/5_1_4.yml/badge.svg
+[2]: https://github.com/nanego/redmine_admin_activity/actions/workflows/6_0_1.yml/badge.svg
 [4]: https://github.com/nanego/redmine_admin_activity/actions/workflows/master.yml/badge.svg
 [5]: https://github.com/nanego/redmine_admin_activity/actions
diff --git a/app/models/journal_setting.rb b/app/models/journal_setting.rb
index cb9314e..1fb7a9c 100644
--- a/app/models/journal_setting.rb
+++ b/app/models/journal_setting.rb
@@ -1,4 +1,5 @@
-class JournalSetting < ActiveRecord::Base
+class JournalSetting < ApplicationRecord
+
   belongs_to :user, :optional => false
   belongs_to :journalized, :polymorphic => true, :optional => true
 
diff --git a/init.rb b/init.rb
index a0daf1d..24e315b 100644
--- a/init.rb
+++ b/init.rb
@@ -11,3 +11,10 @@
   # requires_redmine_plugin :redmine_base_rspec, :version_or_higher => '0.0.4' if Rails.env.test?
   # requires_redmine_plugin :redmine_base_deface, :version_or_higher => '0.0.1'
 end
+
+# Support for Redmine 5
+if Redmine::VERSION::MAJOR < 6
+  class ApplicationRecord < ActiveRecord::Base
+    self.abstract_class = true
+  end
+end
diff --git a/lib/redmine_admin_activity/models/custom_field_patch.rb b/lib/redmine_admin_activity/models/custom_field_patch.rb
index 001af30..357d732 100644
--- a/lib/redmine_admin_activity/models/custom_field_patch.rb
+++ b/lib/redmine_admin_activity/models/custom_field_patch.rb
@@ -12,7 +12,7 @@ def to_s
   end
 end
 
-class CustomField < ActiveRecord::Base
+class CustomField < ApplicationRecord
   prepend RedmineAdminActivity::Models::CustomFieldPatch
 
   def self.representative_columns
diff --git a/lib/redmine_admin_activity/models/issue_template_patch.rb b/lib/redmine_admin_activity/models/issue_template_patch.rb
index 9d67383..9a18818 100644
--- a/lib/redmine_admin_activity/models/issue_template_patch.rb
+++ b/lib/redmine_admin_activity/models/issue_template_patch.rb
@@ -28,7 +28,7 @@ def journalized_deactivation_template(project)
   end
 end
 
-class IssueTemplate < ActiveRecord::Base
+class IssueTemplate < ApplicationRecord
   prepend RedmineAdminActivity::Models::IssueTemplatePatch
 
   has_many :template_projects, through: :issue_template_projects, source: :project, before_remove: :journalized_deactivation_template, after_add: :journalized_activation_template
diff --git a/lib/redmine_admin_activity/models/member_patch.rb b/lib/redmine_admin_activity/models/member_patch.rb
index 4c2a376..f3b7005 100644
--- a/lib/redmine_admin_activity/models/member_patch.rb
+++ b/lib/redmine_admin_activity/models/member_patch.rb
@@ -19,7 +19,7 @@ def update_project_journal
   end
 end
 
-class Member < ActiveRecord::Base
+class Member < ApplicationRecord
   prepend RedmineAdminActivity::Models::MemberPatch
 
   attr_reader :project_journal
diff --git a/lib/redmine_admin_activity/models/organization_patch.rb b/lib/redmine_admin_activity/models/organization_patch.rb
index 627d9df..59d4087 100644
--- a/lib/redmine_admin_activity/models/organization_patch.rb
+++ b/lib/redmine_admin_activity/models/organization_patch.rb
@@ -19,7 +19,7 @@ def journalize_creation(user)
   end
 end
 
-class Organization < ActiveRecord::Base
+class Organization < ApplicationRecord
   prepend RedmineAdminActivity::Models::OrganizationPatch
 
   def self.representative_columns
diff --git a/lib/redmine_admin_activity/models/project_patch.rb b/lib/redmine_admin_activity/models/project_patch.rb
index b664faf..46d0d7d 100644
--- a/lib/redmine_admin_activity/models/project_patch.rb
+++ b/lib/redmine_admin_activity/models/project_patch.rb
@@ -37,7 +37,7 @@ def create_journal
   end
 end
 
-class Project < ActiveRecord::Base
+class Project < ApplicationRecord
   prepend RedmineAdminActivity::Models::ProjectPatch
 
   acts_as_watchable
diff --git a/lib/redmine_admin_activity/models/version_patch.rb b/lib/redmine_admin_activity/models/version_patch.rb
index 567bdbb..4dfd181 100644
--- a/lib/redmine_admin_activity/models/version_patch.rb
+++ b/lib/redmine_admin_activity/models/version_patch.rb
@@ -22,7 +22,7 @@ def save_previous_version
   end
 end
 
-class Version < ActiveRecord::Base
+class Version < ApplicationRecord
   prepend RedmineAdminActivity::Models::VersionPatch
 
   before_update :save_previous_version
diff --git a/spec/controllers/custom_field_enumerations_controller_spec.rb b/spec/controllers/custom_field_enumerations_controller_spec.rb
index 8f36ebf..f488f76 100644
--- a/spec/controllers/custom_field_enumerations_controller_spec.rb
+++ b/spec/controllers/custom_field_enumerations_controller_spec.rb
@@ -1,4 +1,4 @@
-require 'spec_helper'
+require 'rails_helper'
 
 describe CustomFieldEnumerationsController, type: :controller do
   render_views
@@ -12,7 +12,8 @@
     @controller = CustomFieldEnumerationsController.new
     @request = ActionDispatch::TestRequest.create
     @response = ActionDispatch::TestResponse.new
-    User.current = nil
+    User.current = User.find(1)
+    @request.session = ActionController::TestSession.new
     @request.session[:user_id] = 1 #permissions are hard
     ProjectCustomField.create(:name => 'field test', field_format: "enumeration")
   end
diff --git a/spec/controllers/custom_fields_controller_spec.rb b/spec/controllers/custom_fields_controller_spec.rb
index d760d34..8ff1405 100644
--- a/spec/controllers/custom_fields_controller_spec.rb
+++ b/spec/controllers/custom_fields_controller_spec.rb
@@ -1,4 +1,4 @@
-require 'spec_helper'
+require 'rails_helper'
 
 describe CustomFieldsController, type: :controller do
   render_views
@@ -15,6 +15,7 @@
     @request = ActionDispatch::TestRequest.create
     @response = ActionDispatch::TestResponse.new
     User.current = nil
+    @request.session = ActionController::TestSession.new
     @request.session[:user_id] = 1 #permissions are hard
   end
 
diff --git a/spec/controllers/issue_categories_controller_spec.rb b/spec/controllers/issue_categories_controller_spec.rb
index cfb9436..d9673f1 100644
--- a/spec/controllers/issue_categories_controller_spec.rb
+++ b/spec/controllers/issue_categories_controller_spec.rb
@@ -1,4 +1,4 @@
-require 'spec_helper'
+require 'rails_helper'
 
 describe IssueCategoriesController, type: :controller do
   render_views
@@ -12,6 +12,7 @@
 
   before do
     User.current = nil
+    @request.session = ActionController::TestSession.new
     @request.session[:user_id] = 2 #permissions are hard
   end
 
diff --git a/spec/controllers/issue_templates_controller_spec.rb b/spec/controllers/issue_templates_controller_spec.rb
index fa551d8..0481993 100644
--- a/spec/controllers/issue_templates_controller_spec.rb
+++ b/spec/controllers/issue_templates_controller_spec.rb
@@ -1,4 +1,4 @@
-require 'spec_helper'
+require 'rails_helper'
 
 if Redmine::Plugin.installed?(:redmine_templates)
   describe IssueTemplatesController, type: :controller do
@@ -9,6 +9,7 @@
 
     before do
       User.current = nil
+      @request.session = ActionController::TestSession.new
       @request.session[:user_id] = 1
     end
 
diff --git a/spec/controllers/members_controller_patch_spec.rb b/spec/controllers/members_controller_patch_spec.rb
index 5e8b5a9..aa5eb38 100644
--- a/spec/controllers/members_controller_patch_spec.rb
+++ b/spec/controllers/members_controller_patch_spec.rb
@@ -1,4 +1,4 @@
-require 'spec_helper'
+require 'rails_helper'
 
 describe MembersController, type: :controller do
   render_views
@@ -15,6 +15,7 @@
   include Redmine::I18n
 
   before do
+    @request.session = ActionController::TestSession.new
     @request.session[:user_id] = 1 #permissions are hard
     if Redmine::Plugin.installed?(:redmine_limited_visibility)
       member.function_ids = [Function.first.id]
diff --git a/spec/controllers/organizations/memberships_controller_spec.rb b/spec/controllers/organizations/memberships_controller_spec.rb
index 47f5990..cbbb092 100644
--- a/spec/controllers/organizations/memberships_controller_spec.rb
+++ b/spec/controllers/organizations/memberships_controller_spec.rb
@@ -1,4 +1,4 @@
-require 'spec_helper'
+require 'rails_helper'
 
 if Redmine::Plugin.installed?(:redmine_organizations)
   describe Organizations::MembershipsController, type: :controller do
@@ -23,6 +23,7 @@
 
     before do
       User.current = nil
+      @request.session = ActionController::TestSession.new
       @request.session[:user_id] = 1 # permissions are hard
       user.update_attribute(:organization, organization)
       new_user.update_attribute(:organization, organization)
diff --git a/spec/controllers/organizations_controller_spec.rb b/spec/controllers/organizations_controller_spec.rb
index 26d62e8..8d307f9 100644
--- a/spec/controllers/organizations_controller_spec.rb
+++ b/spec/controllers/organizations_controller_spec.rb
@@ -1,4 +1,4 @@
-require 'spec_helper'
+require 'rails_helper'
 
 if Redmine::Plugin.installed?(:redmine_organizations)
   describe OrganizationsController, type: :controller do
@@ -13,6 +13,7 @@
       @request = ActionDispatch::TestRequest.create
       @response = ActionDispatch::TestResponse.new
       User.current = nil
+      @request.session = ActionController::TestSession.new
       @request.session[:user_id] = 1
     end
 
diff --git a/spec/controllers/principal_memberships_controller_patch_spec.rb b/spec/controllers/principal_memberships_controller_patch_spec.rb
index 96a8ad3..37549ec 100644
--- a/spec/controllers/principal_memberships_controller_patch_spec.rb
+++ b/spec/controllers/principal_memberships_controller_patch_spec.rb
@@ -1,4 +1,4 @@
-require 'spec_helper'
+require 'rails_helper'
 
 describe PrincipalMembershipsController, type: :controller do
   render_views
@@ -15,6 +15,7 @@
   include Redmine::I18n
 
   before do
+    @request.session = ActionController::TestSession.new
     @request.session[:user_id] = 1 #permissions are hard
   end
 
diff --git a/spec/controllers/projects_controller_spec.rb b/spec/controllers/projects_controller_spec.rb
index c19e4c4..a9d7075 100644
--- a/spec/controllers/projects_controller_spec.rb
+++ b/spec/controllers/projects_controller_spec.rb
@@ -1,4 +1,4 @@
-require 'spec_helper'
+require 'rails_helper'
 
 describe ProjectsController, type: :controller do
 
@@ -17,6 +17,7 @@
     @request = ActionDispatch::TestRequest.create
     @response = ActionDispatch::TestResponse.new
     User.current = nil
+    @request.session = ActionController::TestSession.new
     @request.session[:user_id] = 2 # permissions are hard
   end
 
diff --git a/spec/controllers/settings_controller_spec.rb b/spec/controllers/settings_controller_spec.rb
index 79bf539..e015434 100644
--- a/spec/controllers/settings_controller_spec.rb
+++ b/spec/controllers/settings_controller_spec.rb
@@ -1,4 +1,4 @@
-require 'spec_helper'
+require 'rails_helper'
 
 describe SettingsController, type: :controller do
 
@@ -11,6 +11,7 @@
     @request = ActionDispatch::TestRequest.create
     @response = ActionDispatch::TestResponse.new
     User.current = nil
+    @request.session = ActionController::TestSession.new
     @request.session[:user_id] = 1 #permissions are hard
   end
 
diff --git a/spec/controllers/trackers_controller_spec.rb b/spec/controllers/trackers_controller_spec.rb
index cae92aa..52a4811 100644
--- a/spec/controllers/trackers_controller_spec.rb
+++ b/spec/controllers/trackers_controller_spec.rb
@@ -1,4 +1,4 @@
-require 'spec_helper'
+require 'rails_helper'
 
 describe TrackersController, type: :controller do
   render_views
@@ -15,6 +15,7 @@
     @request = ActionDispatch::TestRequest.create
     @response = ActionDispatch::TestResponse.new
     User.current = nil
+    @request.session = ActionController::TestSession.new
     @request.session[:user_id] = 1 #permissions are hard
   end
 
diff --git a/spec/controllers/users_controller_spec.rb b/spec/controllers/users_controller_spec.rb
index 37559be..aa60464 100644
--- a/spec/controllers/users_controller_spec.rb
+++ b/spec/controllers/users_controller_spec.rb
@@ -1,4 +1,4 @@
-require 'spec_helper'
+require 'rails_helper'
 
 describe UsersController, type: :controller do
 
@@ -13,6 +13,7 @@
     @request = ActionDispatch::TestRequest.create
     @response = ActionDispatch::TestResponse.new
     User.current = nil
+    @request.session = ActionController::TestSession.new
     @request.session[:user_id] = 1 # permissions admin
   end
 
diff --git a/spec/controllers/versions_controller_spec.rb b/spec/controllers/versions_controller_spec.rb
index fc11a3b..a04367c 100644
--- a/spec/controllers/versions_controller_spec.rb
+++ b/spec/controllers/versions_controller_spec.rb
@@ -1,4 +1,4 @@
-require 'spec_helper'
+require 'rails_helper'
 
 describe VersionsController, type: :controller do
   render_views
@@ -15,6 +15,7 @@
     @request = ActionDispatch::TestRequest.create
     @response = ActionDispatch::TestResponse.new
     User.current = nil
+    @request.session = ActionController::TestSession.new
     @request.session[:user_id] = 1 #permissions are hard
   end
 
diff --git a/spec/controllers/wiki_controller_spec.rb b/spec/controllers/wiki_controller_spec.rb
index a17c90f..2fff499 100644
--- a/spec/controllers/wiki_controller_spec.rb
+++ b/spec/controllers/wiki_controller_spec.rb
@@ -1,4 +1,4 @@
-require 'spec_helper'
+require 'rails_helper'
 
 describe WikiController, type: :controller do
 
@@ -12,7 +12,7 @@
     @controller = WikiController.new
     @request = ActionDispatch::TestRequest.create
     @response = ActionDispatch::TestResponse.new
-    User.current = nil
+    @request.session = ActionController::TestSession.new
     @request.session[:user_id] = 1 #permissions are hard
   end
 
diff --git a/spec/helpers/issues_helper_patch_spec.rb b/spec/helpers/issues_helper_patch_spec.rb
index 40c8968..e8dfbf5 100644
--- a/spec/helpers/issues_helper_patch_spec.rb
+++ b/spec/helpers/issues_helper_patch_spec.rb
@@ -1,4 +1,4 @@
-require "spec_helper"
+require "rails_helper"
 
 describe "IssuesHelperPatch" do
   include ApplicationHelper
diff --git a/spec/helpers/journal_settings_helper_spec.rb b/spec/helpers/journal_settings_helper_spec.rb
index d154225..4204f0e 100644
--- a/spec/helpers/journal_settings_helper_spec.rb
+++ b/spec/helpers/journal_settings_helper_spec.rb
@@ -1,4 +1,4 @@
-require "spec_helper"
+require "rails_helper"
 
 describe "JournalSettingsHelper" do
   include ApplicationHelper
diff --git a/spec/helpers/projects_helper_patch_spec.rb b/spec/helpers/projects_helper_patch_spec.rb
index d41ea42..e530707 100644
--- a/spec/helpers/projects_helper_patch_spec.rb
+++ b/spec/helpers/projects_helper_patch_spec.rb
@@ -1,4 +1,4 @@
-require "spec_helper"
+require "rails_helper"
 
 describe ProjectsHelper, :type => :controller do
 
@@ -12,6 +12,7 @@
     @request = ActionDispatch::TestRequest.create
     @response = ActionDispatch::TestResponse.new
     User.current = nil
+    @request.session = ActionController::TestSession.new
     @request.session[:user_id] = 3
   end
 
diff --git a/spec/helpers/settings_helper_patch_spec.rb b/spec/helpers/settings_helper_patch_spec.rb
index 379d1d5..dddd3b3 100644
--- a/spec/helpers/settings_helper_patch_spec.rb
+++ b/spec/helpers/settings_helper_patch_spec.rb
@@ -1,4 +1,4 @@
-require "spec_helper"
+require "rails_helper"
 
 describe SettingsHelper, :type => :controller do
 
@@ -9,6 +9,7 @@
     @request = ActionDispatch::TestRequest.create
     @response = ActionDispatch::TestResponse.new
     User.current = nil
+    @request.session = ActionController::TestSession.new
     @request.session[:user_id] = 1
   end
 
diff --git a/spec/models/journal_setting_spec.rb b/spec/models/journal_setting_spec.rb
index bf08a85..0f3e61a 100644
--- a/spec/models/journal_setting_spec.rb
+++ b/spec/models/journal_setting_spec.rb
@@ -1,4 +1,4 @@
-require "spec_helper"
+require "rails_helper"
 
 RSpec.describe JournalSetting, type: :model do
 
diff --git a/spec/system/activities_system_spec.rb b/spec/system/activities_system_spec.rb
index e63fc31..a61bc07 100644
--- a/spec/system/activities_system_spec.rb
+++ b/spec/system/activities_system_spec.rb
@@ -1,4 +1,4 @@
-require "spec_helper"
+require "rails_helper"
 
 RSpec.describe "activities", type: :system do
   fixtures :projects, :users, :email_addresses, :roles, :members, :member_roles,