diff --git a/src/socketio/base_client.py b/src/socketio/base_client.py
index 0232dca..2bcaafc 100644
--- a/src/socketio/base_client.py
+++ b/src/socketio/base_client.py
@@ -38,7 +38,8 @@ class BaseClient:
     def __init__(self, reconnection=True, reconnection_attempts=0,
                  reconnection_delay=1, reconnection_delay_max=5,
                  randomization_factor=0.5, logger=False, serializer='default',
-                 json=None, handle_sigint=True, **kwargs):
+                 json=None, handle_sigint=True, serializer_args=None,
+                 **kwargs):
         global original_signal_handler
         if handle_sigint and original_signal_handler is None and \
                 threading.current_thread() == threading.main_thread():
@@ -63,6 +64,7 @@ class BaseClient:
             self.packet_class = msgpack_packet.MsgPackPacket
         else:
             self.packet_class = serializer
+        self.packet_class_args = serializer_args or {}
         if json is not None:
             self.packet_class.json = json
             engineio_options['json'] = json
@@ -283,6 +285,9 @@ class BaseClient:
         self.callbacks[namespace][id] = callback
         return id
 
+    def _create_packet(self, *args, **kwargs):
+        return self.packet_class(*args, **kwargs, **self.packet_class_args)
+
     def _handle_eio_connect(self):  # pragma: no cover
         raise NotImplementedError()
 
diff --git a/src/socketio/base_server.py b/src/socketio/base_server.py
index d134eba..873e969 100644
--- a/src/socketio/base_server.py
+++ b/src/socketio/base_server.py
@@ -15,7 +15,7 @@ class BaseServer:
 
     def __init__(self, client_manager=None, logger=False, serializer='default',
                  json=None, async_handlers=True, always_connect=False,
-                 namespaces=None, **kwargs):
+                 namespaces=None, serializer_args=None, **kwargs):
         engineio_options = kwargs
         engineio_logger = engineio_options.pop('engineio_logger', None)
         if engineio_logger is not None:
@@ -27,6 +27,7 @@ class BaseServer:
             self.packet_class = msgpack_packet.MsgPackPacket
         else:
             self.packet_class = serializer
+        self.packet_class_args = serializer_args or {}
         if json is not None:
             self.packet_class.json = json
             engineio_options['json'] = json
@@ -252,6 +253,10 @@ class BaseServer:
             handler = self.namespace_handlers['*']
             args = (namespace, *args)
         return handler, args
+    
+    def _create_packet(self, *args, **kwargs):
+        return self.packet_class(*args, **kwargs,
+                                 **self.packet_class_args)
 
     def _handle_eio_connect(self):  # pragma: no cover
         raise NotImplementedError()