diff --git a/scripts/upgrade b/scripts/upgrade
index fe8df2b..9bc7acd 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -132,23 +132,25 @@ then
 	ynh_store_file_checksum "/etc/nginx/conf.d/$domain.d/$app.conf"
 fi
 
+#=================================================
+# INSTALL ERLANG and ELIXIR
+#=================================================
+ynh_print_info "Installing erlang and elixir ..."
+
+if [ "$(lsb_release --codename --short)" == "jessie" ]; then
+	sudo apt install -y ../sources/esl-erlang_21.2.6-1~debian~jessie_amd64.deb
+	sudo apt install -y ../sources/elixir_1.8.1-2~debian~jessie_amd64.deb
+elif 
+	[ "$(lsb_release --codename --short)" == "stretch" ]; then
+	sudo apt install -y ../sources/esl-erlang_21.2.6-1~debian~stretch_amd64.deb
+	sudo apt install -y ../sources/elixir_1.8.1-2~debian~stretch_amd64.deb
+fi
+
 #=================================================
 # UPGRADE DEPENDENCIES
 #=================================================
 ynh_print_info "Upgrading dependencies..."
 
-# Add erlang for Debian Jessie 
-
-if [ "$(lsb_release --codename --short)" == "jessie" ]; then
-	echo "deb http://packages.erlang-solutions.com/debian jessie contrib" | tee /etc/apt/sources.list.d/erlang-solutions.list
-elif 
-	[ "$(lsb_release --codename --short)" == "stretch" ]; then
-	echo "deb http://packages.erlang-solutions.com/debian stretch contrib" | tee /etc/apt/sources.list.d/erlang-solutions.list
-fi
-sudo wget https://packages.erlang-solutions.com/debian/erlang_solutions.asc
-sudo apt-key add erlang_solutions.asc
-sudo rm erlang_solutions.asc
-
 # install dependencies
 ynh_install_app_dependencies git build-essential openssl ssh sudo postgresql postgresql-contrib elixir erlang-dev erlang-parsetools erlang-xmerl erlang-tools