diff --git a/src/types/events/base-events.ts b/src/types/events/base-events.ts
index 2d35cd663..8389f48b4 100644
--- a/src/types/events/base-events.ts
+++ b/src/types/events/base-events.ts
@@ -11,6 +11,7 @@ export type SlackEvent =
   | AppHomeOpenedEvent
   | AppMentionEvent
   | AppUninstalledEvent
+  | CallsRejectedEvent
   | ChannelArchiveEvent
   | ChannelCreatedEvent
   | ChannelDeletedEvent
@@ -159,6 +160,14 @@ export interface AppUninstalledEvent extends StringIndexed {
   type: 'app_uninstalled';
 }
 
+export interface CallsRejectedEvent extends StringIndexed {
+  type: 'calls_rejected';
+  call_id: string;
+  user_id: string;
+  channel_id: string;
+  external_unique_id: string;
+}
+
 export interface ChannelArchiveEvent extends StringIndexed {
   type: 'channel_archive';
   channel: string;