diff --git a/pybtc/connector/block_loader.py b/pybtc/connector/block_loader.py
index ae53ff8..b767b13 100644
--- a/pybtc/connector/block_loader.py
+++ b/pybtc/connector/block_loader.py
@@ -10,8 +10,8 @@ import sys
 import aiojsonrpc
 import traceback
 from pybtc.connector.utils import decode_block_tx
-# import pickle
-import msgpack as pickle
+
+import _pickle as pickle
 from lru import LRU
 
 
diff --git a/pybtc/connector/connector.py b/pybtc/connector/connector.py
index 240ef23..23563dc 100644
--- a/pybtc/connector/connector.py
+++ b/pybtc/connector/connector.py
@@ -12,7 +12,7 @@ import zmq
 import zmq.asyncio
 import asyncio
 import time
-from msgpack import loads, dumps
+from _pickle import loads, dumps
 
 class Connector:
     def __init__(self, node_rpc_url, node_zerromq_url, logger,
diff --git a/pybtc/test/block.py b/pybtc/test/block.py
index 754a9e8..da63c53 100644
--- a/pybtc/test/block.py
+++ b/pybtc/test/block.py
@@ -603,15 +603,8 @@ class BlockDeserializeTests(unittest.TestCase):
         bt = (
             Block(fc[:-1], format="raw", keep_raw_tx=False),
               )
-        print("decoded block", time.time() - qt )
-        import msgpack
-        qt = time.time()
-        k = msgpack.dumps(bt)
-        print("decoded block dump", time.time() - qt)
-        qt = time.time()
-        p = msgpack.loads(k)
-        print("decoded block load", time.time() - qt)
-        import pickle
+
+        import _pickle as pickle
         qt = time.time()
         k = pickle.dumps(bt)
         print("decoded block dump", time.time() - qt)
@@ -620,14 +613,6 @@ class BlockDeserializeTests(unittest.TestCase):
         print("decoded block load", time.time() - qt)
         print(p[0]["hash"])
 
-        qt = time.time()
-        k = pickle.dumps(bt, protocol = pickle.HIGHEST_PROTOCOL)
-        print("decoded block dump", time.time() - qt)
-        qt = time.time()
-        p = pickle.loads(k)
-        print("decoded block load", time.time() - qt)
-        print(p[0]["hash"])
-
 
 
         import cProfile