diff --git a/scripts/upgrade b/scripts/upgrade
index f59abb4..2eaddb4 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -104,6 +104,7 @@ ynh_script_progression --message="Installing $app..." --weight=60
 
 pushd $install_dir
  	ynh_use_nodejs
+ 	ynh_exec_warn_less npm install pnpm -g
  	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH ETHERPAD_PRODUCTION=true bin/installDeps.sh
 popd