diff --git a/src/types/title/index.ts b/src/types/title/index.ts
index 254c253..af6388e 100644
--- a/src/types/title/index.ts
+++ b/src/types/title/index.ts
@@ -18,7 +18,7 @@ export const Title = z.object({
       status: z.nullable(WatchStatus),
       progress: NullableNumberSchema,
       id: z.number().int(),
-      updatedAt: z.number().int().openapi({ format: "int64" }),
+      updatedAt: z.number().int().openapi({ format: "int64" }).optional(),
     }),
   ),
   countryOfOrigin: countryCodeSchema,