diff --git a/hydrogen/requirements.txt b/hydrogen/requirements.txt
index 85a2b7b..3f0917e 100644
--- a/hydrogen/requirements.txt
+++ b/hydrogen/requirements.txt
@@ -1,6 +1,6 @@
 records==0.5.3
 cryptography==2.8
-tornado==6.0.4
+tornado==6.4.1
 requests==2.23.0
 future==0.18.2
 pycurl>=7.43.0.5