diff --git a/zstackbuild/pypi_source/requirements.txt b/zstackbuild/pypi_source/requirements.txt
index fb686993ac..845276e6a8 100644
--- a/zstackbuild/pypi_source/requirements.txt
+++ b/zstackbuild/pypi_source/requirements.txt
@@ -5,7 +5,7 @@ argparse==1.3.0
 CherryPy==3.2.4
 configobj==5.0.6
 ecdsa==0.13
-Flask==0.10.1
+Flask==1.0
 Flask-Script==2.0.5
 importlib==1.0.3
 itsdangerous==0.24