diff --git a/scripts/_common.sh b/scripts/_common.sh
index 13ece48..d49f6e2 100755
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -6,7 +6,7 @@
 
 # dependencies used by the app
 pkg_dependencies="git build-essential postgresql postgresql-contrib openssl ssh sudo"
-extra_pkg_dependencies="elixir esl-erlang"
+extra_pkg_dependencies="elixir erlang-dev erlang-tools erlang-parsetools erlang-eldap erlang-xmerl esl-erlang"
 
 #=================================================
 # PERSONAL HELPERS
diff --git a/scripts/upgrade b/scripts/upgrade
index 4d89c8c..06a165a 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -149,8 +149,6 @@ fi
 #=================================================
 ynh_print_info "Upgrading dependencies..."
 
-ynh_remove_app_dependencies
-
 ynh_install_app_dependencies $pkg_dependencies
 
 #=================================================