diff --git a/OPENAPI_VERSION b/OPENAPI_VERSION
index 2597d2c7..85019444 100644
--- a/OPENAPI_VERSION
+++ b/OPENAPI_VERSION
@@ -1 +1 @@
-v515
\ No newline at end of file
+v518
\ No newline at end of file
diff --git a/lib/stripe/resources/issuing/card_design.rb b/lib/stripe/resources/issuing/card_design.rb
index 21983cb5..f7324b06 100644
--- a/lib/stripe/resources/issuing/card_design.rb
+++ b/lib/stripe/resources/issuing/card_design.rb
@@ -5,6 +5,7 @@ module Stripe
   module Issuing
     # A Card Design is a logical grouping of a Card Bundle, card logo, and carrier text that represents a product line.
     class CardDesign < APIResource
+      extend Stripe::APIOperations::Create
       extend Stripe::APIOperations::List
       include Stripe::APIOperations::Save
 
@@ -35,6 +36,15 @@ module Stripe
           )
         end
 
+        def self.reject_testmode(card_design, params = {}, opts = {})
+          request_stripe_object(
+            method: :post,
+            path: format("/v1/test_helpers/issuing/card_designs/%<card_design>s/status/reject", { card_design: CGI.escape(card_design) }),
+            params: params,
+            opts: opts
+          )
+        end
+
         def activate_testmode(params = {}, opts = {})
           @resource.request_stripe_object(
             method: :post,
@@ -52,6 +62,15 @@ module Stripe
             opts: opts
           )
         end
+
+        def reject_testmode(params = {}, opts = {})
+          @resource.request_stripe_object(
+            method: :post,
+            path: format("/v1/test_helpers/issuing/card_designs/%<card_design>s/status/reject", { card_design: CGI.escape(@resource["id"]) }),
+            params: params,
+            opts: opts
+          )
+        end
       end
     end
   end