diff --git a/tests/test-4/requirements.txt b/tests/test-4/requirements.txt
index b1a74eb..c2f95a0 100644
--- a/tests/test-4/requirements.txt
+++ b/tests/test-4/requirements.txt
@@ -1,6 +1,6 @@
 autopep8==1.4.4
 Click==7.0
-Flask==1.1.1
+Flask==2.2.5
 gunicorn==19.10.0
 itsdangerous==1.1.0
 Jinja2==2.10.3