diff --git a/src/NetMQ/NetMQ.nuspec b/src/NetMQ/NetMQ.nuspec
index 3a5ea21..ec17d3c 100644
--- a/src/NetMQ/NetMQ.nuspec
+++ b/src/NetMQ/NetMQ.nuspec
@@ -16,7 +16,7 @@
     <copyright>Copyright 2015</copyright>
     <tags>ZeroMQ 0MQ CLRZMQ NetMQ Messaging ZMQ transport distributed</tags>
     <dependencies>
-      <dependency id="AsyncIO" version="0.1.18.0" />
+      <dependency id="AsyncIO" version="0.1.20.0" />
     </dependencies>
   </metadata>
   <files>