diff --git a/scripts/upgrade b/scripts/upgrade
index b5f3138..83f3600 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -142,6 +142,7 @@ pushd "$final_path" || ynh_die
 	ynh_use_nodejs
 	ynh_exec_warn_less yarn install  --allow-root
 	yarn global add bower
+	bower cache clean
 	bower install --allow-root
 popd || ynh_die