diff --git a/aws_lambda_powertools/utilities/idempotency/base.py b/aws_lambda_powertools/utilities/idempotency/base.py
index f93b9097611..f6a3563c103 100644
--- a/aws_lambda_powertools/utilities/idempotency/base.py
+++ b/aws_lambda_powertools/utilities/idempotency/base.py
@@ -60,7 +60,7 @@ def _prepare_data(data: Any) -> Any:
 
     # Convert from Pydantic model
     if callable(getattr(data, "model_dump", None)):
-        return data.model_dump()
+        return data.model_dump(mode="json")
 
     # Convert from event source data class
     if callable(getattr(data, "dict", None)):
diff --git a/tests/functional/idempotency/_pydantic/test_idempotency_with_pydantic.py b/tests/functional/idempotency/_pydantic/test_idempotency_with_pydantic.py
index f8e3debbc30..ea50c1e2e69 100644
--- a/tests/functional/idempotency/_pydantic/test_idempotency_with_pydantic.py
+++ b/tests/functional/idempotency/_pydantic/test_idempotency_with_pydantic.py
@@ -1,4 +1,5 @@
 from typing import Optional
+from uuid import UUID
 
 import pytest
 from pydantic import BaseModel
@@ -194,6 +195,19 @@ class Foo(BaseModel):
     assert as_dict == expected_result
 
 
+def test_idempotent_function_pydantic_uuid():
+    # Scenario _prepare_data should convert a pydantic model with UUIDs to a dict
+    # with serialization of UUIDs to strings
+    class Foo(BaseModel):
+        uuid: UUID
+
+    uuid = UUID("01234567-0123-0123-0123-0123456789ab")
+    expected_result = {"uuid": str(uuid)}
+    data = Foo(uuid=uuid)
+    as_dict = _prepare_data(data)
+    assert as_dict == expected_result
+
+
 @pytest.mark.parametrize("data", [None, "foo", ["foo"], 1, True, {}])
 def test_idempotent_function_other(data):
     # All other data types should be left as is