diff --git a/install_zotero.sh b/install_zotero.sh
index a1d9db2..605bcf2 100755
--- a/install_zotero.sh
+++ b/install_zotero.sh
@@ -13,13 +13,9 @@ echo "######################################################"
 echo "install required packages"
 
 echo "add key for elasticsearch repository"
-wget -qO - http://packages.elasticsearch.org/GPG-KEY-elasticsearch | apt-key add -
-
+wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -
 echo "add debian wheezy backports repository"
-# removed for the time being, potentially not required anymore
-# sed -i '$s,$,\ndeb http://ftp.acc.umu.se./debian wheezy-backports main,'  /etc/apt/sources.list
-sed -i '$s,$,\ndeb http://packages.elasticsearch.org/elasticsearch/1.4/debian stable main,'  /etc/apt/sources.list
-
+echo "deb https://artifacts.elastic.co/packages/6.x/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic-6.x.list
 echo "update package cache"
 apt-get update