diff --git a/example/docker/requirements.txt b/example/docker/requirements.txt
index c176422..aa02475 100644
--- a/example/docker/requirements.txt
+++ b/example/docker/requirements.txt
@@ -1,4 +1,4 @@
-tornado==4.5
+tornado==6.3.3
 shortuuid==0.4.3
 cerberus==1.0.1
 PyExecJS==1.4.0