DockerCLI/docs/reference/commandline/swarm_update.md

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---
title: "swarm update"
description: "The swarm update command description and usage"
keywords: ["swarm, update"]
---
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# swarm update
```markdown
Usage: docker swarm update [OPTIONS]
Update the swarm
Options:
--cert-expiry duration Validity period for node certificates (default 2160h0m0s)
--dispatcher-heartbeat duration Dispatcher heartbeat period (default 5s)
--external-ca value Specifications of one or more certificate signing endpoints
--help Print usage
--task-history-limit int Task history retention limit (default 5)
```
Updates a swarm with new parameter values. This command must target a manager node.
```bash
$ docker swarm update --cert-expiry 720h
```
## Related information
* [swarm init](swarm_init.md)
* [swarm join](swarm_join.md)
* [swarm leave](swarm_leave.md)