diff --git a/setup.py b/setup.py
index 1842a142aecf2..cc2d4f314feb3 100644
--- a/setup.py
+++ b/setup.py
@@ -228,7 +228,7 @@ def do_setup():
             'configparser>=3.5.0, <3.6.0',
             'croniter>=0.3.17, <0.4',
             'dill>=0.2.2, <0.3',
-            'flask==0.12.2',
+            'flask>=0.12, <0.13',
             'flask-appbuilder>=1.9.6, <2.0.0',
             'flask-admin==1.4.1',
             'flask-caching>=1.3.3, <1.4.0',