diff --git a/requirements.txt b/requirements.txt
index 531d481..b979a07 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-tornado==6.3.3
+tornado==6.4
 isodate==0.6.1
 pytest==8.0.1
 schwifty==2023.06.0