diff --git a/setup.py b/setup.py
index 15fa55a..1c7a534 100644
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,7 @@
         "environment-kernels==1.1.1",
         "hurry.filesize==0.9",
         "jupyter==1.0.0",
-        "tornado==5.0.2",
+        "tornado==6.3.3",
     ],
     tests_require = [
         "moto",