diff --git a/client/client.cpp b/client/client.cpp
index dbad5e7..8397c06 100644
--- a/client/client.cpp
+++ b/client/client.cpp
@@ -50,7 +50,7 @@ TSimpleTask Client(Poller& poller, TAddress addr) {
     try {
         while ((line = co_await lineReader.Read())) {
             while (inflight >= maxInflight) {
-                co_await poller.Sleep(std::chrono::milliseconds(0));
+                co_await poller.Yield();
             }
 
             inflight++;
diff --git a/coroio b/coroio
index 32fa847..91886e6 160000
--- a/coroio
+++ b/coroio
@@ -1 +1 @@
-Subproject commit 32fa847f49f97b66cf3dd36e247a022462f9308f
+Subproject commit 91886e693c178b9f6b6a07803feb5db8eea02f28