diff --git a/pybtc/connector.py b/pybtc/connector.py
index c85c956..8772a4f 100644
--- a/pybtc/connector.py
+++ b/pybtc/connector.py
@@ -15,6 +15,7 @@ import asyncio
 import time
 import io
 from collections import OrderedDict
+import pylru
 
 class Connector:
     def __init__(self, node_rpc_url, node_zerromq_url, logger,
@@ -77,6 +78,7 @@ class Connector:
         self.non_cached_blocks = 0
         self.total_received_tx_time = 0
         self.start_time = time.time()
+        self.tmp = pylru.lrucache(1000000)
 
         # cache and system
         self.block_preload_cache_limit = block_preload_cache_limit
@@ -629,7 +631,8 @@ class Connector:
             else:
                 address = b"".join((bytes([out["nType"]]), out["addressHash"]))
             outpoint = b"".join((tx["txId"], int_to_bytes(i)))
-            self.utxo.set(outpoint, pointer, out["value"], address)
+            self.tmp[outpoint] = (pointer, out["value"], address)
+            # self.utxo.set(outpoint, pointer, out["value"], address)
 
     async def get_stxo(self, tx, block_height, block_index):
         stxo, missed = set(), set()
diff --git a/setup.py b/setup.py
index 73acbba..ed117f0 100644
--- a/setup.py
+++ b/setup.py
@@ -140,6 +140,7 @@ setup(name='pybtc',
       package_data={
           'pybtc': ['bip39_word_list/*.txt', 'test/*.txt'],
       },
+      install_requires=['pylru'],
       cmdclass={
         'build_clib': build_clib,
         'build_ext': build_ext,