diff --git a/phenopipe-web/requirements.txt b/phenopipe-web/requirements.txt
index 9a5ed07..db7dc2a 100644
--- a/phenopipe-web/requirements.txt
+++ b/phenopipe-web/requirements.txt
@@ -13,7 +13,7 @@ docutils==0.14
 enum==0.4.6
 enum34==1.1.6
 et-xmlfile==1.0.1
-Flask==0.11.1
+Flask==1.0
 Flask-Cors==3.0.2
 Flask-GraphQL==1.4.0
 Flask-JWT-Extended==1.3.0