diff --git a/types/index.d.ts b/types/index.d.ts
index 015cd619..7dddf3b0 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -311,7 +311,7 @@ export namespace JWKS {
 
 export namespace JWS {
   interface JWSJSON {
-    payload: string;
+    payload: string | Buffer;
   }
 
   interface JWSRecipient {