diff --git a/MusicKitInstance.d.ts b/MusicKitInstance.d.ts
index 971f989..f6203f3 100644
--- a/MusicKitInstance.d.ts
+++ b/MusicKitInstance.d.ts
@@ -167,7 +167,7 @@ export interface MusicKitInstance {
      * @param callback - a callable function, whose arguments depend on the event listened to
      * @param options - Any further options (currently only 'once', which, if set to true, removes the listener after it was triggered once)
      */
-    'addEventListener': ( name: string, callback: CallableFunction, options: {
+    'addEventListener': ( name: string, callback: CallableFunction, options?: {
         'once': boolean
     } ) => void;
     /**
diff --git a/package.json b/package.json
index 69fe939..cfe7640 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "musickitjs-v3-types",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "description": "Types for musickit js version 3.0",
   "keywords": [
     "musickitjs",