diff --git a/lecture11/example_projects/requirements.txt b/lecture11/example_projects/requirements.txt
index a1bbed9..cf851b9 100644
--- a/lecture11/example_projects/requirements.txt
+++ b/lecture11/example_projects/requirements.txt
@@ -1,4 +1,4 @@
 Flask==1.0.2
 Flask-WTF==0.14.2
 Flask-SQLAlchemy==2.3.2
-bleach==2.1.3
+bleach==3.3.0