diff --git a/.gitignore b/.gitignore
index 1d8064a..b8fd051 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,4 +7,4 @@ doc
 .ruby-gemset
 gemfiles/*.gemfile.lock
 zuora.log
-.DS_Store
+.DS_Store
\ No newline at end of file
diff --git a/Gemfile.lock b/Gemfile.lock
index 13cad09..01db494 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -73,7 +73,7 @@ GEM
     pry (0.11.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
-    rack (1.6.8)
+    rack (2.0.9.1)
     rack-test (0.7.0)
       rack (>= 1.0, < 3)
     rake (12.1.0)
diff --git a/spec/factories/payment_methods.rb b/spec/factories/payment_methods.rb
index 50723ff..d2baad2 100644
--- a/spec/factories/payment_methods.rb
+++ b/spec/factories/payment_methods.rb
@@ -8,8 +8,8 @@
     credit_card_holder_name "Example User"
     credit_card_number "4111111111111111"
     credit_card_type "Visa"
-    credit_card_expiration_month "9"
-    credit_card_expiration_year "2018"
+    credit_card_expiration_month 9
+    credit_card_expiration_year { Time.now.year + 2 }
   end
 
   factory :payment_method_debit_card, :parent => :payment_method_credit_card do