diff --git a/package-lock.json b/package-lock.json
index a8a6765f..03c22a7e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "discord-api-types",
-  "version": "0.5.0",
+  "version": "0.6.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/v8/gateway/index.ts b/v8/gateway/index.ts
index b29bce68..87fea71f 100644
--- a/v8/gateway/index.ts
+++ b/v8/gateway/index.ts
@@ -581,7 +581,7 @@ export type GatewayWebhooksUpdateDispatch = DataPayload<
  */
 export interface GatewayHeartbeat {
 	op: GatewayOPCodes.Heartbeat;
-	d: number;
+	d: number | null;
 }
 
 /**