diff --git a/zip_0143.py b/zip_0143.py
index 72d6eb5..12218ca 100644
--- a/zip_0143.py
+++ b/zip_0143.py
@@ -3,10 +3,10 @@ from pyblake2 import blake2b
 import struct
 
 from transaction import (
+    LegacyTransaction,
     MAX_MONEY,
     OVERWINTER_TX_VERSION,
     Script,
-    Transaction,
 )
 from tv_output import render_args, render_tv, Some
 from tv_rand import Rand
@@ -111,7 +111,7 @@ def main():
 
     test_vectors = []
     for i in range(10):
-        tx = Transaction(rand, OVERWINTER_TX_VERSION)
+        tx = LegacyTransaction(rand, OVERWINTER_TX_VERSION)
         scriptCode = Script(rand)
         nIn = rand.i8() % (len(tx.vin) + 1)
         if nIn == len(tx.vin):
diff --git a/zip_0243.py b/zip_0243.py
index 3edef09..fdb42bd 100644
--- a/zip_0243.py
+++ b/zip_0243.py
@@ -3,10 +3,10 @@ from pyblake2 import blake2b
 import struct
 
 from transaction import (
+    LegacyTransaction,
     MAX_MONEY,
     SAPLING_TX_VERSION,
     Script,
-    Transaction,
 )
 from tv_output import render_args, render_tv, Some
 from tv_rand import Rand
@@ -118,7 +118,7 @@ def main():
 
     test_vectors = []
     for _ in range(10):
-        tx = Transaction(rand, SAPLING_TX_VERSION)
+        tx = LegacyTransaction(rand, SAPLING_TX_VERSION)
         scriptCode = Script(rand)
         nIn = rand.i8() % (len(tx.vin) + 1)
         if nIn == len(tx.vin):
diff --git a/zip_0244.py b/zip_0244.py
index a9d6f68..3dec433 100644
--- a/zip_0244.py
+++ b/zip_0244.py
@@ -6,7 +6,7 @@ from transaction import (
     MAX_MONEY,
     NU5_TX_VERSION,
     Script,
-    Transaction,
+    TransactionV5,
 )
 from tv_output import render_args, render_tv, Some
 from tv_rand import Rand
@@ -266,7 +266,7 @@ def main():
 
     test_vectors = []
     for _ in range(10):
-        tx = Transaction(rand, NU5_TX_VERSION, consensusBranchId)
+        tx = TransactionV5(rand, consensusBranchId)
         txid = txid_digest(tx)
 
         # If there are any transparent inputs, derive a corresponding transparent sighash.