diff --git a/shared_memory_dict/serializers.py b/shared_memory_dict/serializers.py
index 18e6c36..1069180 100644
--- a/shared_memory_dict/serializers.py
+++ b/shared_memory_dict/serializers.py
@@ -25,6 +25,8 @@ def loads(self, data: bytes) -> dict:
 
 class JSONSerializer:
 
+    __slots__ = ()
+
     encoder = json.JSONEncoder
     decoder = json.JSONDecoder
 
@@ -43,6 +45,9 @@ def loads(self, data: bytes) -> dict:
 
 
 class PickleSerializer:
+
+    __slots__ = ()
+
     def dumps(self, obj: dict) -> bytes:
         try:
             return pickle.dumps(obj, pickle.HIGHEST_PROTOCOL)