diff --git a/notebook_python/requirements_notebook.txt b/notebook_python/requirements_notebook.txt
index f4e4500..5c48324 100644
--- a/notebook_python/requirements_notebook.txt
+++ b/notebook_python/requirements_notebook.txt
@@ -7,7 +7,7 @@ async-lru==2.0.5
 attrs==25.3.0
 babel==2.17.0
 beautifulsoup4==4.14.2
-bleach==6.2.0
+bleach==6.4.0
 certifi==2025.8.3
 cffi==2.0.0
 charset-normalizer==3.4.3