diff --git a/src/notebooks/requirements.txt b/src/notebooks/requirements.txt
index 2de1c27..e25eb40 100644
--- a/src/notebooks/requirements.txt
+++ b/src/notebooks/requirements.txt
@@ -98,7 +98,7 @@ soupsieve==2.6
 stack-data==0.6.3
 terminado==0.18.1
 tinycss2==1.3.0
-tornado==6.5.1
+tornado==6.5.5
 traitlets==5.14.3
 types-python-dateutil==2.9.0.20240316
 tzdata==2024.1