diff --git a/setup.py b/setup.py
index d9b054c..ae6e411 100644
--- a/setup.py
+++ b/setup.py
@@ -51,7 +51,7 @@
 
     install_requires=[
         'requests>=2.18.4',
-        'tornado==4.5.3'
+        'tornado==6.3.3'
     ],
 
     # List additional groups of dependencies here