---
title: Technical Advisory 10009
description: "A-10009: ZITADEL now requires CockroachDB with enabledurablelockingforserializable flag for distributed locking on FOR UPDATE statements in v2.53.0"
---

## Date and Version

Version: 2.53.0

Date: 2024-05-28

## Description

There were rare cases where CockroachDB got blocked during runtime of ZITADEL and returned `WRITE_TOO_OLD`-errors to ZITADEL. The root cause of the problem is described in [this GitHub issue of the database](https://github.com/cockroachdb/cockroach/issues/77119). The workaround provided by the database is enabling the `enable_durable_locking_for_serializable`-flag as described [here](https://github.com/cockroachdb/cockroach/issues/75456#issuecomment-1936277716).

Because enabling flags requires admin privileges the statement must be executed manually or by executing `zitadel init` command.

## Statement

Ensure lock distribution for `FOR UPDATE`-statements on CockroachDB.

## Mitigation

CockroachDB version >= 23.2.

## Impact

Adding additional raft queries to `FOR UPDATE`-statements can impact performance slightly but ensures availability of the system.