diff --git a/src/judas_server/backend/handler/__init__.py b/src/judas_server/backend/handler/__init__.py
index d133708..dc07972 100644
--- a/src/judas_server/backend/handler/__init__.py
+++ b/src/judas_server/backend/handler/__init__.py
@@ -1,4 +1,5 @@
 from .base_handler import BaseHandler
 from .hello_handler import HelloHandler
+from .ack_handler import AckHandler
 
-__all__ = ["BaseHandler", "HelloHandler"]
+__all__ = ["BaseHandler", "HelloHandler", "AckHandler"]