diff --git a/requirements.txt b/requirements.txt
index 06639cb..b76306e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -37,4 +37,4 @@ tornado==4.5.1
 traitlets==4.2.1
 urllib3==1.21.1
 watchdog==0.8.3
-websockets==3.3
+websockets==9.1