diff --git a/tests/sample-sites/python-flask/requirements.txt b/tests/sample-sites/python-flask/requirements.txt
index 78e963f..8a4789c 100644
--- a/tests/sample-sites/python-flask/requirements.txt
+++ b/tests/sample-sites/python-flask/requirements.txt
@@ -1,7 +1,7 @@
 Click==7.0
 Flask==1.1.1
 itsdangerous==1.1.0
-Jinja2==2.10.1
+Jinja2==2.11.3
 MarkupSafe==1.1.1
 waitress==1.4.3
 Werkzeug==0.15.5