diff --git a/app/services/workarea/zipco/checkout.rb b/app/services/workarea/zipco/checkout.rb
index a11f1cb..0a2cc52 100644
--- a/app/services/workarea/zipco/checkout.rb
+++ b/app/services/workarea/zipco/checkout.rb
@@ -17,7 +17,7 @@ def complete
         if result == "referred"
           order.set_zipco_referred_at!
         else
-          order.update_attributes(zipco_referred_at: nil)
+          order.update(zipco_referred_at: nil)
         end
 
         order.user_id = user.try(:id)
diff --git a/app/services/workarea/zipco/setup.rb b/app/services/workarea/zipco/setup.rb
index c273c77..b19af0c 100644
--- a/app/services/workarea/zipco/setup.rb
+++ b/app/services/workarea/zipco/setup.rb
@@ -20,7 +20,7 @@ def set_checkout_data
 
         payment.set_zipco(token: create_order_response.zipco_order_id)
 
-        order.update_attributes!(zipco_order_id: create_order_response.zipco_order_id)
+        order.update!(zipco_order_id: create_order_response.zipco_order_id)
       end
 
       def redirect_uri
diff --git a/test/integration/workarea/storefront/zipco_integration_test.rb b/test/integration/workarea/storefront/zipco_integration_test.rb
index c50ac48..d7eb44e 100644
--- a/test/integration/workarea/storefront/zipco_integration_test.rb
+++ b/test/integration/workarea/storefront/zipco_integration_test.rb
@@ -95,7 +95,7 @@ def test_start_clears_credit_card
       def test_cancel_removes_zipco
         payment = Payment.find(order.id)
 
-        order.update_attributes(zipco_order_id: '1234')
+        order.update(zipco_order_id: '1234')
 
         payment.set_zipco(token: '1234')
 
@@ -112,7 +112,7 @@ def test_cancel_removes_zipco
       def test_decline_removes_zipco
         payment = Payment.find(order.id)
 
-        order.update_attributes(zipco_order_id: '1234')
+        order.update(zipco_order_id: '1234')
 
         payment.set_zipco(token: '1234')
 
diff --git a/test/services/workarea/zipco/order_test.rb b/test/services/workarea/zipco/order_test.rb
index bff5681..eb567fd 100644
--- a/test/services/workarea/zipco/order_test.rb
+++ b/test/services/workarea/zipco/order_test.rb
@@ -9,7 +9,7 @@ def test_to_h
         payment = Workarea::Payment.find(order.id)
 
         payment = Workarea::Payment.find(order.id)
-        payment.profile.update_attributes!(store_credit: 2.00)
+        payment.profile.update!(store_credit: 2.00)
         payment.set_store_credit
         payment.tenders.first.amount = 2.to_m
         payment.save
diff --git a/workarea-zipco.gemspec b/workarea-zipco.gemspec
index ece690c..f154a32 100644
--- a/workarea-zipco.gemspec
+++ b/workarea-zipco.gemspec
@@ -16,4 +16,5 @@ Gem::Specification.new do |spec|
   spec.files = `git ls-files`.split("\n")
 
   spec.add_dependency 'workarea', '>= 3.4.x'
+spec.required_ruby_version = ['>= 2.7', '< 3.5']
 end