diff --git a/requirements.txt b/requirements.txt
index e1a4faf..e17f9ef 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,7 @@
-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
+Flask-Login>=0.1.3
+Flask-Mail>=0.7.3
+Flask-Principal>=0.3.3
+Flask-WTF>=0.8
+itsdangerous>=0.17
+passlib>=1.6.1
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',