diff --git a/types/stripe/index.d.ts b/types/stripe/index.d.ts
index 3a2b0611b9..15bb2d4cee 100644
--- a/types/stripe/index.d.ts
+++ b/types/stripe/index.d.ts
@@ -10709,6 +10709,12 @@ declare namespace Stripe {
              */
             proration_date?: number;
 
+            /**
+             * Determines how to handle prorations when the billing cycle changes or if an item’s quantity changes.
+             * Prorations can be disabled by passing none.
+             */
+            proration_behavior?: 'create_prorations' | 'always_invoice' | 'none';
+
             /**
              * The quantity you'd like to apply to the subscription you're creating. For example, if your plan is £10/user/month, and your customer
              * has 5 users, you could pass 5 as the quantity to have the customer charged £50 (5 x £10) monthly. If you update a subscription but
@@ -10994,6 +11000,12 @@ declare namespace Stripe {
              * proration that was previewed with the upcoming invoice endpoint.
              */
             proration_date?: number;
+
+            /**
+             * Determines how to handle prorations when the billing cycle changes or if an item’s quantity changes.
+             * Prorations can be disabled by passing none.
+             */
+            proration_behavior?: 'create_prorations' | 'always_invoice' | 'none';
         }
 
         interface ISubscriptionItemListOptions extends IListOptionsCreated {