diff --git a/layercake/layercake/batch.py b/layercake/layercake/batch.py
index 9ef90a0..bf644b6 100644
--- a/layercake/layercake/batch.py
+++ b/layercake/layercake/batch.py
@@ -2,8 +2,9 @@ import inspect
 import logging
 import os
 from contextlib import AbstractContextManager
+from dataclasses import dataclass
 from enum import Enum
-from typing import Any, Callable, NamedTuple, Self, Sequence
+from typing import Any, Callable, Self, Sequence
 
 LOG_LEVEL = os.getenv('LOG_LEVEL', 'INFO').upper()
 
@@ -18,7 +19,8 @@ class Status(Enum):
     FAIL = 'fail'
 
 
-class Result(NamedTuple):
+@dataclass(frozen=True)
+class Result:
     status: Status
     input_record: Any
     output: Any | None = None
@@ -129,5 +131,8 @@ class BatchProcessor(AbstractContextManager):
             return Result(
                 status=Status.FAIL,
                 input_record=record,
-                cause=exc,
+                cause={
+                    'type': type(exc).__name__,
+                    'message': str(exc),
+                },
             )
diff --git a/layercake/pyproject.toml b/layercake/pyproject.toml
index c593209..af95cce 100644
--- a/layercake/pyproject.toml
+++ b/layercake/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "layercake"
-version = "0.6.3"
+version = "0.6.4"
 description = "Packages shared dependencies to optimize deployment and ensure consistency across functions."
 readme = "README.md"
 authors = [
diff --git a/layercake/tests/test_batch.py b/layercake/tests/test_batch.py
index 318d3ad..3f0a676 100644
--- a/layercake/tests/test_batch.py
+++ b/layercake/tests/test_batch.py
@@ -18,11 +18,18 @@ def test_batch():
     with processor(records=records, handler=record_handler) as p:
         processed_messages = p.process()
 
-        assert len(processed_messages) == 3
+        assert processed_messages == (
+            Result(status=Status.SUCCESS, input_record=True, output=True, cause=None),
+            Result(status=Status.SUCCESS, input_record=True, output=True, cause=None),
+            Result(
+                status=Status.FAIL,
+                input_record=False,
+                output=None,
+                cause={'type': 'ValueError', 'message': 'Invalid record'},
+            ),
+        )
 
-        fail_record = processed_messages[2]
-        assert isinstance(fail_record.cause, ValueError)
-        assert str(fail_record.cause) == 'Invalid record'
+        assert len(processed_messages) == 3
 
     assert processor.successes == [True, True]
     assert processor.failures == [False]
@@ -48,7 +55,7 @@ def test_batch_context():
         processed_messages = processor.process()
 
         assert processed_messages == (
-            Result(Status.SUCCESS, output=4, input_record=2),
-            Result(Status.SUCCESS, output=6, input_record=3),
-            Result(Status.SUCCESS, output=8, input_record=4),
+            Result(status=Status.SUCCESS, input_record=2, output=4, cause=None),
+            Result(status=Status.SUCCESS, input_record=3, output=6, cause=None),
+            Result(status=Status.SUCCESS, input_record=4, output=8, cause=None),
         )
diff --git a/layercake/uv.lock b/layercake/uv.lock
index 880922c..cd6a0a3 100644
--- a/layercake/uv.lock
+++ b/layercake/uv.lock
@@ -589,7 +589,7 @@ wheels = [
 
 [[package]]
 name = "layercake"
-version = "0.6.2"
+version = "0.6.4"
 source = { editable = "." }
 dependencies = [
     { name = "arnparse" },