diff --git a/setup.py b/setup.py
index 2c9fdb6..d306dc3 100644
--- a/setup.py
+++ b/setup.py
@@ -41,7 +41,7 @@ def run(self):
         'pilbox': ['frontalface.xml'],
         },
       install_requires=[
-        'tornado==5.1.0',
+        'tornado==6.3.3',
         'Pillow==5.2.0',
         'sphinx-me==0.2.1',
         ],