diff --git a/pybtc/connector/utxo.py b/pybtc/connector/utxo.py
index 3fe92d6..13f2c53 100644
--- a/pybtc/connector/utxo.py
+++ b/pybtc/connector/utxo.py
@@ -34,8 +34,8 @@ class UTXO():
         self.outs_total = 0
 
     def set(self, outpoint, pointer, amount, address):
-        self.cached.put({outpoint: (pointer, amount, address)})
-
+        # self.cached.put({outpoint: (pointer, amount, address)})
+        self.cached[outpoint] = (pointer, amount, address)
 
     def remove(self, outpoint):
         del self.cached[outpoint]