diff --git a/tasks/side-channel/flask/requirements.txt b/tasks/side-channel/flask/requirements.txt
index 89a938a..037b603 100644
--- a/tasks/side-channel/flask/requirements.txt
+++ b/tasks/side-channel/flask/requirements.txt
@@ -1,5 +1,5 @@
 absl-py==0.1.10
-bleach==1.5.0
+bleach==3.3.0
 certifi==2018.1.18
 chardet==3.0.4
 click==6.7