diff --git a/challenge/index.ts b/challenge/index.ts
index 73e28a5..972cd09 100644
--- a/challenge/index.ts
+++ b/challenge/index.ts
@@ -29,11 +29,12 @@ const txn = algosdk.makePaymentTxnWithSuggestedParamsFromObject({
     amount: 1000000,
 });
 
-await algodClient.sendRawTransaction(txn).do();
+const sgntxn = txn.signTxn(sender.sk);
+await algodClient.sendRawTransaction(sgntxn).do();
 const result = await algosdk.waitForConfirmation(
     algodClient,
     txn.txID().toString(),
     3
 );
 
-console.log(`Payment of ${result.txn.txn.amt} microAlgos was sent to ${receiver.addr} at confirmed round ${result['confirmed-round']}`);
\ No newline at end of file
+console.log(`Payment of ${result.txn.txn.amt} microAlgos was sent to ${receiver.addr} at confirmed round ${result['confirmed-round']}`);