diff --git a/requirements.txt b/requirements.txt
index e9f518912..f12b72b76 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ werkzeug>=2.0.3
 wheel==0.33.6
 gunicorn==20.1.0
 requests==2.20.0
-flask==2.0.3
+flask==1.1.4
 flask-session==0.3.2
 flask-helper==0.19
 cache==1.0.3