diff --git a/layercake/layercake/dynamodb.py b/layercake/layercake/dynamodb.py
index 75e096a..6f8d291 100644
--- a/layercake/layercake/dynamodb.py
+++ b/layercake/layercake/dynamodb.py
@@ -1,6 +1,7 @@
 import json
 import logging
 import os
+import warnings
 from abc import ABC, abstractmethod
 from base64 import urlsafe_b64decode, urlsafe_b64encode
 from dataclasses import dataclass
@@ -33,7 +34,7 @@ serializer = TypeSerializer()
 deserializer = TypeDeserializer()
 
 
-def _serialize_to_basic_types(data: Any) -> str | dict | set:
+def _serialize_to_basic_types(data: Any) -> str | dict | set | list:
     match data:
         case datetime():
             return data.isoformat()
@@ -42,7 +43,12 @@ def _serialize_to_basic_types(data: Any) -> str | dict | set:
         case IPv4Address():
             return str(data)
         case tuple() | list():
-            return set(_serialize_to_basic_types(v) for v in data)
+            serialized = [_serialize_to_basic_types(v) for v in data]
+
+            if any(isinstance(v, dict) for v in serialized):
+                return serialized
+
+            return set(serialized)
         case dict():
             return {k: _serialize_to_basic_types(v) for k, v in data.items()}
         case _:
@@ -85,6 +91,12 @@ else:
             *,
             delimiter: str = '#',
         ) -> str:
+            warnings.warn(
+                'ComposeKey() is deprecated and will be removed in the future.',
+                DeprecationWarning,
+                stacklevel=2,
+            )
+
             if isinstance(keyparts, str):
                 keyparts = (keyparts,)
 
@@ -119,6 +131,12 @@ else:
 
     class PrefixKey(str):
         def __new__(cls, prefix: str, delimiter: str | None = '#') -> str:
+            warnings.warn(
+                'PrefixKey() is deprecated and will be removed in the future.',
+                DeprecationWarning,
+                stacklevel=2,
+            )
+
             if not delimiter:
                 return super().__new__(cls, prefix)
 
@@ -145,12 +163,15 @@ if TYPE_CHECKING:
             The sort key value.
         path_spec: str, optional
             Optional specification for nested data extraction.
+        rename_key : str, optional
+            If provided, renames the sort key in the output.
         remove_prefix: str, optional
             Optional prefix to remove from the key when forming the result dict.
         """
 
         sk: str
         path_spec: str | None = None
+        rename_key: str | None = None
         remove_prefix: str | None = None
 
 else:
@@ -166,6 +187,8 @@ else:
             The sort key value.
         path_spec: str, optional
             Optional specification for nested data extraction.
+        rename_key : str, optional
+            If provided, renames the sort key in the output.
         remove_prefix: str, optional
             Optional prefix to remove from the key when forming the result dict.
         """
@@ -175,6 +198,7 @@ else:
             sk: str,
             *,
             path_spec: str | None = None,
+            rename_key: str | None = None,
             remove_prefix: str | None = None,
         ) -> str:
             return super().__new__(cls, sk)
@@ -184,12 +208,14 @@ else:
             sk: str,
             *,
             path_spec: str | None = None,
+            rename_key: str | None = None,
             remove_prefix: str | None = None,
         ) -> None:
             # __init__ is used to store the parameters for later reference.
             # For immutable types like str, __init__ cannot change the instance's value.
             self.sk = sk
             self.path_spec = path_spec
+            self.rename_key = rename_key
             self.remove_prefix = remove_prefix
 
 
@@ -1074,6 +1100,9 @@ class DynamoDBCollection:
             if pair.rename_key:
                 return pair.rename_key
 
+            if getattr(sk, 'rename_key', None):
+                return sk.rename_key
+
             if not isinstance(sk, SortKey):
                 return pk
 
diff --git a/layercake/pyproject.toml b/layercake/pyproject.toml
index 7116ec4..804bff6 100644
--- a/layercake/pyproject.toml
+++ b/layercake/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "layercake"
-version = "0.9.10"
+version = "0.9.12"
 description = "Packages shared dependencies to optimize deployment and ensure consistency across functions."
 readme = "README.md"
 authors = [
diff --git a/layercake/tests/test_dynamodb.py b/layercake/tests/test_dynamodb.py
index 630c004..e911593 100644
--- a/layercake/tests/test_dynamodb.py
+++ b/layercake/tests/test_dynamodb.py
@@ -31,24 +31,42 @@ def test_serialize():
         'ip': {'S': '127.0.0.1'},
     }
 
-    assert serialize(
-        {'ids': ('1', '2', '3')},
-    ) == {
-        'ids': {
-            'L': [{'S': '1'}, {'S': '2'}, {'S': '3'}],
-        }
-    }
+    assert (
+        'SS'
+        in serialize(
+            {'ids': ('1', '2', '3')},
+        )['ids']
+    )
 
-    assert serialize(
-        {'ids': ['1', '2', '3']},
-    ) == {
-        'ids': {
-            'L': [{'S': '1'}, {'S': '2'}, {'S': '3'}],
-        }
-    }
+    assert (
+        'SS'
+        in serialize(
+            {'ids': ['1', '2', '3']},
+        )['ids']
+    )
 
     assert serialize({'ids': {'1'}}) == {'ids': {'SS': ['1']}}
 
+    assert serialize(
+        {
+            'users': [
+                {'name': 'Sérgio'},
+                {'name': 'Tiago'},
+            ]
+        },
+    ) == {
+        'users': {
+            'L': [
+                {
+                    'M': {'name': {'S': 'Sérgio'}},
+                },
+                {
+                    'M': {'name': {'S': 'Tiago'}},
+                },
+            ]
+        }
+    }
+
 
 def test_composekey():
     key = ComposeKey(('122', 'abc'), prefix='schedules', delimiter=':')
@@ -263,7 +281,11 @@ def test_collection_get_items(
         )
         + SortKey('0')
         + SortKey('0')
-        + SortKey('metadata#billing_policy', path_spec='payment_method')
+        + SortKey(
+            'metadata#billing_policy',
+            path_spec='payment_method',
+            rename_key='payment_method',
+        )
         + SortKey('metadata#payment_policy', remove_prefix='metadata#'),
     )
 
@@ -273,7 +295,7 @@ def test_collection_get_items(
         'id': 'cJtK9SsnJhKPyxESe7g3DG',
         'cnpj': '15608435000190',
         'email': 'org+15608435000190@users.noreply.betaeducacao.com.br',
-        'metadata#billing_policy': 'PIX',
+        'payment_method': 'PIX',
         'payment_policy': {'due_days': Decimal('90')},
     }
 
diff --git a/layercake/uv.lock b/layercake/uv.lock
index 10f85c1..eb87007 100644
--- a/layercake/uv.lock
+++ b/layercake/uv.lock
@@ -675,7 +675,7 @@ wheels = [
 
 [[package]]
 name = "layercake"
-version = "0.9.9"
+version = "0.9.11"
 source = { editable = "." }
 dependencies = [
     { name = "arnparse" },