diff --git a/scripts/upgrade b/scripts/upgrade
index b680e0a..ff93575 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -166,7 +166,11 @@ chown -R "$app":"$app" "$final_path"
 ( cd $final_path/$app && sudo -u "$app" MIX_ENV=prod mix local.hex --force )
 ( cd $final_path/$app && sudo -u "$app" MIX_ENV=prod mix local.rebar --force )
 ( cd $final_path/$app && sudo -u "$app" mix deps.get )
+ynh_psql_execute_as_root \
+"ALTER USER $app WITH SUPERUSER;"
 ( cd $final_path/$app && sudo -u "$app" MIX_ENV=prod mix ecto.migrate --force )
+ynh_psql_execute_as_root \
+"ALTER USER $app WITH NOSUPERUSER;"
 
 #=================================================
 # MODIFY A CONFIG FILE