diff --git a/petale/settings.py b/petale/settings.py
index a67da93..eff3289 100644
--- a/petale/settings.py
+++ b/petale/settings.py
@@ -40,15 +40,15 @@ INSTALLED_APPS = (
     'petale'
 )
 
-MIDDLEWARE_CLASSES = (
+MIDDLEWARE = [
+    'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
-    'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
-)
+]
 
 ROOT_URLCONF = 'petale.urls'