diff --git a/setup.py b/setup.py
index 2dfa26fe7af18..cc55836bd3864 100644
--- a/setup.py
+++ b/setup.py
@@ -55,7 +55,7 @@ def get_git_sha():
         'celery',
         'colorama',
         'cryptography',
-        'flask',
+        'flask<=1.0.0',
         'flask-appbuilder',
         'flask-cache',
         'flask-compress',