diff --git a/tests/robustness/client/client.go b/tests/robustness/client/client.go
index 9a20ef85989..531fbacba7c 100644
--- a/tests/robustness/client/client.go
+++ b/tests/robustness/client/client.go
@@ -174,23 +174,6 @@ func (c *RecordingClient) Txn(ctx context.Context) clientv3.Txn {
 	return &wrappedTxn{txn: c.client.Txn(ctx), c: c}
 }
 
-func (c *RecordingClient) OldTxn(ctx context.Context, conditions []clientv3.Cmp, onSuccess []clientv3.Op, onFailure []clientv3.Op) (*clientv3.TxnResponse, error) {
-	txn := c.client.Txn(ctx).If(
-		conditions...,
-	).Then(
-		onSuccess...,
-	).Else(
-		onFailure...,
-	)
-	c.kvMux.Lock()
-	defer c.kvMux.Unlock()
-	callTime := time.Since(c.baseTime)
-	resp, err := txn.Commit()
-	returnTime := time.Since(c.baseTime)
-	c.kvOperations.AppendTxn(conditions, onSuccess, onFailure, callTime, returnTime, resp, err)
-	return resp, err
-}
-
 func (c *RecordingClient) LeaseGrant(ctx context.Context, ttl int64) (*clientv3.LeaseGrantResponse, error) {
 	c.kvMux.Lock()
 	defer c.kvMux.Unlock()
diff --git a/tests/robustness/traffic/etcd.go b/tests/robustness/traffic/etcd.go
index 022d7b19aae..d8823ecd3e4 100644
--- a/tests/robustness/traffic/etcd.go
+++ b/tests/robustness/traffic/etcd.go
@@ -213,7 +213,9 @@ func (c etcdTrafficClient) Request(ctx context.Context, request etcdRequestType,
 		}
 	case MultiOpTxn:
 		var resp *clientv3.TxnResponse
-		resp, err = c.client.OldTxn(opCtx, nil, c.pickMultiTxnOps(), nil)
+		resp, err = c.client.Txn(opCtx).Then(
+			c.pickMultiTxnOps()...,
+		).Commit()
 		if resp != nil {
 			rev = resp.Header.Revision
 		}
@@ -234,7 +236,11 @@ func (c etcdTrafficClient) Request(ctx context.Context, request etcdRequestType,
 			}
 			txnCtx, txnCancel := context.WithTimeout(ctx, RequestTimeout)
 			var resp *clientv3.TxnResponse
-			resp, err = c.client.OldTxn(txnCtx, []clientv3.Cmp{clientv3.Compare(clientv3.ModRevision(key), "=", expectedRevision)}, []clientv3.Op{clientv3.OpPut(key, fmt.Sprintf("%d", c.idProvider.NewRequestID()))}, nil)
+			resp, err = c.client.Txn(txnCtx).If(
+				clientv3.Compare(clientv3.ModRevision(key), "=", expectedRevision),
+			).Then(
+				clientv3.OpPut(key, fmt.Sprintf("%d", c.idProvider.NewRequestID())),
+			).Commit()
 			txnCancel()
 			if resp != nil {
 				rev = resp.Header.Revision