diff --git a/install_zotero.sh b/install_zotero.sh
index 7ab3d03..696ed6b 100755
--- a/install_zotero.sh
+++ b/install_zotero.sh
@@ -12,11 +12,15 @@ echo "######################################################"
 
 echo "install required packages"
 
+echo "add debian wheezy repository"
+sed -i '$s,$,\ndeb http://http.debian.net/debian wheezy-backports main,'  /etc/apt/sources.list
+
 echo "update package cache"
 apt-get update
 
 echo "dependencies for dataserver"
 apt-get install -y apache2 libapache2-mod-php5 mysql-server memcached zendframework php5-cli php5-memcache php5-mysql php5-curl php5-memcached
+apt-get -t wheezy-backports install -y php-aws-sdk php-doctrine-cache
 
 echo "general dependencies"
 apt-get install -y git gnutls-bin runit libapache2-modsecurity curl
@@ -43,15 +47,8 @@ git checkout fc607170ab2ca751097648d48a5d38e15e9d5f6a
 echo "install add_user script"
 cp add_user /srv/zotero/dataserver/admin
 
-echo "install composer"
-cd /srv/zotero/dataserver
-curl -sS https://getcomposer.org/installer | php
-
-echo "install dependencies"
-php composer.phar install
-
-echo "remove composer"
-rm composer.phar
+echo "patch master.sql"
+cp master.sql /srv/zotero/dataserver/misc
 
 echo "prepare directory rights"
 chown www-data:www-data /srv/zotero/dataserver/tmp