diff --git a/scripts/upgrade b/scripts/upgrade
index 6b8deb6..e3323df 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -103,6 +103,12 @@ yunohost service add $app --description="Zero Knowledge realtime collaborative e
 #=================================================
 ynh_script_progression --message="Updating a configuration file..." --weight=1
 
+CONF=$install_dir/config/config.js
+if test -f "$CONF"; then
+    supportMailboxKey=$(ynh_read_var_in_file --file=$CONF --key=supportMailboxPublicKey)
+	adminKeys=$(ynh_read_var_in_file --file=$CONF --key=adminKeys)
+fi
+
 ynh_add_config --template="config.js" --destination="$install_dir/config/config.js"
 
 chmod 600 "$install_dir/config/config.js"