diff --git a/requirements.txt b/requirements.txt
index e1a4faf..36a5f6c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
-Flask==0.8
 Flask-Login==0.1
 Flask-Principal==0.2
 Flask-Script==0.3.2
 Flask-WTF==0.5.4
 passlib=1.5.3
+Flask>=0.9
diff --git a/setup.py b/setup.py
index cfead93..4025e75 100644
--- a/setup.py
+++ b/setup.py
@@ -34,7 +34,7 @@ setup(
     include_package_data=True,
     platforms='any',
     install_requires=[
-        'Flask>=0.8',
+        'Flask>=0.9',
         'Flask-Login>=0.1.3',
         'Flask-Mail>=0.7.3',
         'Flask-Principal>=0.3.3',