diff --git a/web/requirements.txt b/web/requirements.txt
index 97c94190..5faa3cee 100644
--- a/web/requirements.txt
+++ b/web/requirements.txt
@@ -1,7 +1,7 @@
 cqi
 docker
 eventlet
-Flask
+Flask~=1.1.0
 Flask-Assets
 Flask-Login
 Flask-Mail