diff --git a/app/models/accountify/contact.rb b/app/models/accountify/contact.rb
index 0b3b93c..cb16a57 100644
--- a/app/models/accountify/contact.rb
+++ b/app/models/accountify/contact.rb
@@ -1,5 +1,5 @@
 module Accountify
-  class Contact < ActiveRecord::Base
+  class Contact < ApplicationRecord
     self.table_name = 'accountify_contacts'
 
     validates :organisation_id, presence: true
diff --git a/app/models/accountify/invoice.rb b/app/models/accountify/invoice.rb
index d2f6922..5f4cbdf 100644
--- a/app/models/accountify/invoice.rb
+++ b/app/models/accountify/invoice.rb
@@ -1,5 +1,5 @@
 module Accountify
-  class Invoice < ActiveRecord::Base
+  class Invoice < ApplicationRecord
     self.table_name = 'accountify_invoices'
 
     module Status
diff --git a/app/models/accountify/invoice_line_item.rb b/app/models/accountify/invoice_line_item.rb
index 423ea55..91bef5b 100644
--- a/app/models/accountify/invoice_line_item.rb
+++ b/app/models/accountify/invoice_line_item.rb
@@ -1,5 +1,5 @@
 module Accountify
-  class InvoiceLineItem < ActiveRecord::Base
+  class InvoiceLineItem < ApplicationRecord
     self.table_name = 'accountify_invoice_line_items'
   end
 end
diff --git a/app/models/accountify/invoice_status_summary.rb b/app/models/accountify/invoice_status_summary.rb
index be8ae55..5da2ec6 100644
--- a/app/models/accountify/invoice_status_summary.rb
+++ b/app/models/accountify/invoice_status_summary.rb
@@ -1,5 +1,5 @@
 module Accountify
-  class InvoiceStatusSummary < ActiveRecord::Base
+  class InvoiceStatusSummary < ApplicationRecord
     self.table_name = 'accountify_invoice_status_summaries'
 
     validates :organisation_id, presence: true
diff --git a/app/models/accountify/organisation.rb b/app/models/accountify/organisation.rb
index f87f0be..e1d432f 100644
--- a/app/models/accountify/organisation.rb
+++ b/app/models/accountify/organisation.rb
@@ -1,5 +1,5 @@
 module Accountify
-  class Organisation < ActiveRecord::Base
+  class Organisation < ApplicationRecord
     self.table_name = 'accountify_organisations'
 
     has_many :events, -> { order(created_at: :asc) }, as: :eventable
diff --git a/app/models/application_record.rb b/app/models/application_record.rb
new file mode 100644
index 0000000..10a4cba
--- /dev/null
+++ b/app/models/application_record.rb
@@ -0,0 +1,3 @@
+class ApplicationRecord < ActiveRecord::Base
+  self.abstract_class = true
+end
diff --git a/app/models/event.rb b/app/models/event.rb
index dbc5573..99104be 100644
--- a/app/models/event.rb
+++ b/app/models/event.rb
@@ -1,4 +1,4 @@
-class Event < ActiveRecord::Base
+class Event < ApplicationRecord
   self.table_name = 'events'
 
   # associations