diff --git a/sjrpc/core/rpcconnection.py b/sjrpc/core/rpcconnection.py
index bf70d0b7b54bc70c89bca903b5f8f1e8b1d11f98..c5b1daa41d3b1a4ff0df35bcd74f4a2982c6a10e 100644
--- a/sjrpc/core/rpcconnection.py
+++ b/sjrpc/core/rpcconnection.py
@@ -25,8 +25,8 @@ class RpcConnection(object):
     This class manage a single peer connection.
     '''
     
-    RECV_BUF_SIZE = 1024
-    SEND_BUF_SIZE = 1024
+    RECV_BUF_SIZE = 4096
+    SEND_BUF_SIZE = 4096
     REQUEST_MESSAGE = {'id': None, 'method': None, 'args': [], 'kwargs': {}}
     RESPONSE_MESSAGE = {'id': None, 'return': None, 'error': None}