diff --git a/src/transaction.js b/src/transaction.js
index 986260770..5791c4cde 100644
--- a/src/transaction.js
+++ b/src/transaction.js
@@ -39,6 +39,9 @@ export class Transaction {
     }
     this._networkPassphrase = networkPassphrase;
 
+    // temp hack
+    envelope = envelope.value();
+
     // since this transaction is immutable, save the tx
     this.tx = envelope.tx();
     this.source = StrKey.encodeEd25519PublicKey(
@@ -243,7 +246,9 @@ export class Transaction {
   toEnvelope() {
     const tx = this.tx;
     const signatures = this.signatures;
-    const envelope = new xdr.TransactionEnvelope({ tx, signatures });
+    const envelope = new xdr.TransactionEnvelope.envelopeTypeTx(
+      new xdr.TransactionV1Envelope({ tx, signatures })
+    );
 
     return envelope;
   }
diff --git a/src/transaction_builder.js b/src/transaction_builder.js
index d5fdd2339..a17c10a40 100644
--- a/src/transaction_builder.js
+++ b/src/transaction_builder.js
@@ -208,13 +208,14 @@ export class TransactionBuilder {
 
     this.timebounds.minTime = UnsignedHyper.fromString(this.timebounds.minTime.toString());
     this.timebounds.maxTime = UnsignedHyper.fromString(this.timebounds.maxTime.toString())
-    
+
     attrs.timeBounds = new xdr.TimeBounds(this.timebounds);
 
     const xtx = new xdr.Transaction(attrs);
     xtx.operations(this.operations);
 
-    const xenv = new xdr.TransactionEnvelope({ tx: xtx });
+
+    const xenv = xdr.TransactionEnvelope.envelopeTypeTx(new xdr.TransactionV1Envelope({ tx: xtx }));
     const tx = new Transaction(xenv, this.networkPassphrase);
 
     this.source.incrementSequenceNumber();