diff --git a/scripts/upgrade b/scripts/upgrade
index ee1d44b..0caa80b 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -78,6 +78,9 @@ if [ "$upgrade_type" == "UPGRADE_APP" ]
 then
 	ynh_script_progression --message="Upgrading source files..." --weight=10
 
+	# Create a temporary directory
+	tmpdir="$(mktemp -d)"
+
 	cp -a "$final_path/config/config.json" "$tmpdir/config.json"
 	# Remove the app directory securely
 	ynh_secure_remove --file=$final_path