diff --git a/packages/core/lib/queues/HandlerContainer.ts b/packages/core/lib/queues/HandlerContainer.ts
index d37943a8..4314266a 100644
--- a/packages/core/lib/queues/HandlerContainer.ts
+++ b/packages/core/lib/queues/HandlerContainer.ts
@@ -110,7 +110,7 @@ export class MessageHandlerConfig<
 export class MessageHandlerConfigBuilder<
   MessagePayloadSchemas extends object,
   ExecutionContext,
-  PrehandlerOutput,
+  PrehandlerOutput = undefined,
 > {
   private readonly configs: MessageHandlerConfig<
     MessagePayloadSchemas,
diff --git a/packages/core/package.json b/packages/core/package.json
index 3a22c8f0..9ffabff6 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@message-queue-toolkit/core",
-  "version": "9.0.0",
+  "version": "9.0.1",
   "private": false,
   "license": "MIT",
   "description": "Useful utilities, interfaces and base classes for message queue handling. Supports AMQP and SQS with a common abstraction on top currently",