diff --git a/types/cookie-session/index.d.ts b/types/cookie-session/index.d.ts
index a0b7a2e6b0..af48860396 100644
--- a/types/cookie-session/index.d.ts
+++ b/types/cookie-session/index.d.ts
@@ -15,7 +15,7 @@ declare namespace CookieSessionInterfaces {
         /**
          * The name of the cookie to set, defaults to session.
          */
-        name: string;
+        name?: string;
 
         /**
          * The list of keys to use to sign & verify cookie values. Set cookies are always signed with keys[0], while the other keys are valid for verification, allowing for key rotation.
@@ -47,6 +47,11 @@ declare namespace CookieSessionInterfaces {
          */
         domain?: string;
 
+        /**
+         * a boolean or string indicating whether the cookie is a "same site" cookie (false by default). This can be set to 'strict', 'lax', or true (which maps to 'strict').
+         */
+        sameSite?: "strict" | "lax" | boolean;
+
         /**
          * a boolean indicating whether the cookie is only to be sent over HTTPS (false by default for HTTP, true by default for HTTPS).
          */