diff --git a/test/udp/FixUdp.SendAndReceive.cs b/test/udp/FixUdp.SendAndReceive.cs
index 3919a982..068e15e5 100644
--- a/test/udp/FixUdp.SendAndReceive.cs
+++ b/test/udp/FixUdp.SendAndReceive.cs
@@ -117,7 +117,7 @@ async Task Client(Host host)
             client.To.Data(dataSent);
             client.To.Event(eventSent.name, eventSent.data);
 
-            Thread.Sleep(millisecondsTimeout: 50);
+            Thread.Sleep(millisecondsTimeout: 100);
             {
                 Assert.True(client.IsOpened);
                 Assert.True(isModify);