diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index f1515ac85..240d0c17f 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -18668,7 +18668,7 @@ interface WindowEventHandlersEventMap {
     "pagehide": PageTransitionEvent;
     "pageshow": PageTransitionEvent;
     "popstate": PopStateEvent;
-    "rejectionhandled": Event;
+    "rejectionhandled": PromiseRejectionEvent;
     "storage": StorageEvent;
     "unhandledrejection": PromiseRejectionEvent;
     "unload": Event;
@@ -18687,7 +18687,7 @@ interface WindowEventHandlers {
     onpagehide: ((this: WindowEventHandlers, ev: PageTransitionEvent) => any) | null;
     onpageshow: ((this: WindowEventHandlers, ev: PageTransitionEvent) => any) | null;
     onpopstate: ((this: WindowEventHandlers, ev: PopStateEvent) => any) | null;
-    onrejectionhandled: ((this: WindowEventHandlers, ev: Event) => any) | null;
+    onrejectionhandled: ((this: WindowEventHandlers, ev: PromiseRejectionEvent) => any) | null;
     onstorage: ((this: WindowEventHandlers, ev: StorageEvent) => any) | null;
     onunhandledrejection: ((this: WindowEventHandlers, ev: PromiseRejectionEvent) => any) | null;
     onunload: ((this: WindowEventHandlers, ev: Event) => any) | null;
@@ -19939,7 +19939,7 @@ declare var ononline: ((this: Window, ev: Event) => any) | null;
 declare var onpagehide: ((this: Window, ev: PageTransitionEvent) => any) | null;
 declare var onpageshow: ((this: Window, ev: PageTransitionEvent) => any) | null;
 declare var onpopstate: ((this: Window, ev: PopStateEvent) => any) | null;
-declare var onrejectionhandled: ((this: Window, ev: Event) => any) | null;
+declare var onrejectionhandled: ((this: Window, ev: PromiseRejectionEvent) => any) | null;
 declare var onstorage: ((this: Window, ev: StorageEvent) => any) | null;
 declare var onunhandledrejection: ((this: Window, ev: PromiseRejectionEvent) => any) | null;
 declare var onunload: ((this: Window, ev: Event) => any) | null;
diff --git a/inputfiles/addedTypes.json b/inputfiles/addedTypes.json
index f7593aeb4..7af5def59 100644
--- a/inputfiles/addedTypes.json
+++ b/inputfiles/addedTypes.json
@@ -195,6 +195,10 @@
                         {
                             "name": "unhandledrejection",
                             "type": "PromiseRejectionEvent"
+                        },
+                        {
+                            "name": "rejectionhandled",
+                            "type": "PromiseRejectionEvent"
                         }
                     ]
                 }