diff --git a/requirements-notebook.txt b/requirements-notebook.txt
index 9199493..784d830 100644
--- a/requirements-notebook.txt
+++ b/requirements-notebook.txt
@@ -92,7 +92,7 @@ soupsieve==2.8.2
 stack-data==0.6.3
 terminado==0.18.1
 tinycss2==1.4.0
-tornado==6.5.4
+tornado==6.5.5
 traitlets==5.14.3
 typing_extensions==4.15.0
 tzdata==2025.3