diff --git a/libs/sdk-js/package.json b/libs/sdk-js/package.json
index 2c6fea683..29510712b 100644
--- a/libs/sdk-js/package.json
+++ b/libs/sdk-js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@langchain/langgraph-sdk",
-  "version": "0.0.64",
+  "version": "0.0.65",
   "description": "Client library for interacting with the LangGraph API",
   "type": "module",
   "packageManager": "yarn@1.22.19",
diff --git a/libs/sdk-js/src/auth/index.ts b/libs/sdk-js/src/auth/index.ts
index c736f5cbb..cf995438d 100644
--- a/libs/sdk-js/src/auth/index.ts
+++ b/libs/sdk-js/src/auth/index.ts
@@ -27,7 +27,10 @@ export class Auth<
 
   on<T extends CallbackEvent>(event: T, callback: OnCallback<T, TUser>): this {
     this["~handlerCache"].callbacks ??= {};
-    this["~handlerCache"].callbacks[event as string] = callback as AnyCallback;
+    const events: string[] = Array.isArray(event) ? event : [event];
+    for (const event of events) {
+      this["~handlerCache"].callbacks[event] = callback as AnyCallback;
+    }
     return this;
   }
 }