diff --git a/setup.py b/setup.py
index e864b2e..0cd849d 100644
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@
   packages=['compactor'],
   install_requires=[
     'trollius',
-    'tornado==4.1',
+    'tornado==6.3.3',
     'twitter.common.lang',
   ],
   extras_require={