diff --git a/.stats.yml b/.stats.yml
index e670c77..6a74fe0 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,2 +1,2 @@
 configured_endpoints: 97
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/orb%2Forb-bf3e71b33372f4a9307f4b6cb689ea46b3cf583ecc5d79eee9601cd0b0467c9a.yml
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/orb%2Forb-0f43f737c6520ed2a2407628511350362959997f89a868c50aa38d47d5791171.yml
diff --git a/src/resources/subscriptions.ts b/src/resources/subscriptions.ts
index 95c807f..4978ecb 100644
--- a/src/resources/subscriptions.ts
+++ b/src/resources/subscriptions.ts
@@ -18360,6 +18360,8 @@ export interface SubscriptionSchedulePlanChangeParams {
    */
   billing_cycle_alignment?: 'unchanged' | 'plan_change_date' | 'start_of_month' | null;
 
+  billing_cycle_anchor_configuration?: SubscriptionSchedulePlanChangeParams.BillingCycleAnchorConfiguration | null;
+
   /**
    * The date that the plan change should take effect. This parameter can only be
    * passed if the `change_option` is `requested_date`.
@@ -20946,6 +20948,29 @@ export namespace SubscriptionSchedulePlanChangeParams {
     }
   }
 
+  export interface BillingCycleAnchorConfiguration {
+    /**
+     * The day of the month on which the billing cycle is anchored. If the maximum
+     * number of days in a month is greater than this value, the last day of the month
+     * is the billing cycle day (e.g. billing_cycle_day=31 for April means the billing
+     * period begins on the 30th.
+     */
+    day: number;
+
+    /**
+     * The month on which the billing cycle is anchored (e.g. a quarterly price
+     * anchored in February would have cycles starting February, May, August, and
+     * November).
+     */
+    month?: number | null;
+
+    /**
+     * The year on which the billing cycle is anchored (e.g. a 2 year billing cycle
+     * anchored on 2021 would have cycles starting on 2021, 2023, 2025, etc.).
+     */
+    year?: number | null;
+  }
+
   export interface RemoveAdjustment {
     /**
      * The id of the adjustment to remove on the subscription.
diff --git a/tests/api-resources/subscriptions.test.ts b/tests/api-resources/subscriptions.test.ts
index bc260de..796d8b3 100644
--- a/tests/api-resources/subscriptions.test.ts
+++ b/tests/api-resources/subscriptions.test.ts
@@ -300,6 +300,7 @@ describe('resource subscriptions', () => {
       align_billing_with_plan_change_date: true,
       auto_collection: true,
       billing_cycle_alignment: 'unchanged',
+      billing_cycle_anchor_configuration: { day: 1, month: 1, year: 0 },
       change_date: '2017-07-21T17:32:28Z',
       coupon_redemption_code: 'coupon_redemption_code',
       credits_overage_rate: 0,