diff --git a/.stats.yml b/.stats.yml
index 9711ed3..e39b31a 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,2 +1,2 @@
 configured_endpoints: 91
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/metronome%2Fmetronome-ebf6ec71381ac4de43a238b439ff137f915f48cdb2533b8422d069cebece35c2.yml
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/metronome%2Fmetronome-d04cc2dc5a1f1bd278783a02c8bbf246f850ce53fe63d7d43cb9df69fae02429.yml
diff --git a/src/resources/billable-metrics.ts b/src/resources/billable-metrics.ts
index 975b7bc..38def17 100644
--- a/src/resources/billable-metrics.ts
+++ b/src/resources/billable-metrics.ts
@@ -96,6 +96,12 @@ export namespace BillableMetricRetrieveResponse {
      */
     aggregation_type?: 'COUNT' | 'LATEST' | 'MAX' | 'SUM' | 'UNIQUE';
 
+    /**
+     * RFC 3339 timestamp indicating when the billable metric was archived. If not
+     * provided, the billable metric is not archived.
+     */
+    archived_at?: string;
+
     custom_fields?: Record<string, string>;
 
     /**
@@ -146,6 +152,12 @@ export interface BillableMetricListResponse {
    */
   aggregation_type?: 'COUNT' | 'LATEST' | 'MAX' | 'SUM' | 'UNIQUE';
 
+  /**
+   * RFC 3339 timestamp indicating when the billable metric was archived. If not
+   * provided, the billable metric is not archived.
+   */
+  archived_at?: string;
+
   custom_fields?: Record<string, string>;
 
   /**
@@ -229,7 +241,12 @@ export interface BillableMetricRetrieveParams {
   billable_metric_id: string;
 }
 
-export interface BillableMetricListParams extends CursorPageParams {}
+export interface BillableMetricListParams extends CursorPageParams {
+  /**
+   * If true, the list of returned metrics will include archived metrics
+   */
+  include_archived?: boolean;
+}
 
 export interface BillableMetricArchiveParams {
   id: string;
diff --git a/src/resources/customers/customers.ts b/src/resources/customers/customers.ts
index 217c517..cc0ac2f 100644
--- a/src/resources/customers/customers.ts
+++ b/src/resources/customers/customers.ts
@@ -322,6 +322,12 @@ export interface CustomerListBillableMetricsResponse {
    */
   aggregation_type?: 'COUNT' | 'LATEST' | 'MAX' | 'SUM' | 'UNIQUE';
 
+  /**
+   * RFC 3339 timestamp indicating when the billable metric was archived. If not
+   * provided, the billable metric is not archived.
+   */
+  archived_at?: string;
+
   custom_fields?: Record<string, string>;
 
   /**
@@ -498,6 +504,11 @@ export interface CustomerListBillableMetricsParams extends CursorPageParams {
    */
   customer_id: string;
 
+  /**
+   * Query param: If true, the list of returned metrics will include archived metrics
+   */
+  include_archived?: boolean;
+
   /**
    * Query param: If true, the list of metrics will be filtered to just ones that are
    * on the customer's current plan
diff --git a/tests/api-resources/billable-metrics.test.ts b/tests/api-resources/billable-metrics.test.ts
index 5247d5a..2ea4f50 100644
--- a/tests/api-resources/billable-metrics.test.ts
+++ b/tests/api-resources/billable-metrics.test.ts
@@ -92,7 +92,10 @@ describe('resource billableMetrics', () => {
   test('list: request options and params are passed correctly', async () => {
     // ensure the request options are being passed correctly by passing an invalid HTTP method in order to cause an error
     await expect(
-      client.billableMetrics.list({ limit: 1, next_page: 'next_page' }, { path: '/_stainless_unknown_path' }),
+      client.billableMetrics.list(
+        { include_archived: true, limit: 1, next_page: 'next_page' },
+        { path: '/_stainless_unknown_path' },
+      ),
     ).rejects.toThrow(Metronome.NotFoundError);
   });
 
diff --git a/tests/api-resources/customers/customers.test.ts b/tests/api-resources/customers/customers.test.ts
index 6db8043..a4dc080 100644
--- a/tests/api-resources/customers/customers.test.ts
+++ b/tests/api-resources/customers/customers.test.ts
@@ -119,6 +119,7 @@ describe('resource customers', () => {
   test('listBillableMetrics: required and optional params', async () => {
     const response = await client.customers.listBillableMetrics({
       customer_id: 'd7abd0cd-4ae9-4db7-8676-e986a4ebd8dc',
+      include_archived: true,
       limit: 1,
       next_page: 'next_page',
       on_current_plan: true,