diff --git a/requirements-notebook.txt b/requirements-notebook.txt
index fa88c9b..ab7a334 100644
--- a/requirements-notebook.txt
+++ b/requirements-notebook.txt
@@ -7,7 +7,7 @@ async-lru==2.3.0
 attrs==26.1.0
 babel==2.18.0
 beautifulsoup4==4.14.3
-bleach==6.3.0
+bleach==6.4.0
 certifi==2026.4.22
 cffi==2.0.0
 charset-normalizer==3.4.7