diff --git a/setup.py b/setup.py
index e273d68..5a624db 100644
--- a/setup.py
+++ b/setup.py
@@ -30,7 +30,7 @@ setup(name='ucloud',
       packages=find_packages(),
       install_requires=[
           'requests',
-          'Flask',
+          'Flask>=1.1.1',
           'flask-restful',
           'bitmath',
           'pyotp',