diff --git a/express-serve-static-core/index.d.ts b/express-serve-static-core/index.d.ts
index a4ce9612e7..e42568b14c 100644
--- a/express-serve-static-core/index.d.ts
+++ b/express-serve-static-core/index.d.ts
@@ -161,6 +161,8 @@ interface CookieOptions {
     path?: string;
     domain?: string;
     secure?: boolean | 'auto';
+    encode?: (val: string) => void;
+    sameSite?: boolean | string;
 }
 
 interface Errback { (err: Error): void; }