diff --git a/requirements.txt b/requirements.txt
index 6753fcb..9a25beb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-tornado==6.3.3
+tornado==6.4
 isodate==0.6.1
 pytest==7.4.3
 schwifty==2023.06.0