diff --git a/test/stripe/issuing/dispute_test.rb b/test/stripe/issuing/dispute_test.rb
index faeb54cb2..f6d69be5e 100644
--- a/test/stripe/issuing/dispute_test.rb
+++ b/test/stripe/issuing/dispute_test.rb
@@ -8,7 +8,7 @@ class DisputeTest < Test::Unit::TestCase
       should "be creatable" do
         dispute = Stripe::Issuing::Dispute.create(
           reason: "fraudulent",
-          transaction: "ipi_123"
+          disputed_transaction: "ipi_123"
         )
         assert_requested :post, "#{Stripe.api_base}/v1/issuing/disputes"
         assert dispute.is_a?(Stripe::Issuing::Dispute)
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 086ad9bd5..e79e75a67 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -16,7 +16,7 @@
 require ::File.expand_path("../test_data", __FILE__)
 
 # If changing this number, please also change it in `.travis.yml`.
-MOCK_MINIMUM_VERSION = "0.30.0".freeze
+MOCK_MINIMUM_VERSION = "0.32.0".freeze
 MOCK_PORT = ENV["STRIPE_MOCK_PORT"] || 12_111
 
 # Disable all real network connections except those that are outgoing to