> For the complete documentation index, see [llms.txt](https://developer.harness.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.harness.io/resilience-testing/chaos-testing/infrastructure/windows/upgrade.md).
# Upgrade Windows infrastructure
Run the commands in **PowerShell as Administrator** on the VM where the Windows chaos infrastructure is installed.
### Uninstall the current version
Replace `1.55.0` with the version currently installed:
```bash
powershell -Command "& { Invoke-WebRequest -Uri 'https://app.harness.io/public/shared/tools/chaos/windows/1.55.0/uninstall.ps1' -OutFile 'uninstall.ps1' -UseBasicParsing; .\uninstall.ps1 }"
```
{% hint style="info" %}
**CAPTURE THE SERVICE ACCOUNT**
Note the account that runs the `WindowsChaosInfrastructure` service before uninstalling. You need the same credentials in the install step.
{% endhint %}
### Install the new version
Replace `1.56.0` with the target version, and supply the captured admin credentials, `infraID`, and `access key` (both readable from `C:\HCE\config.yaml`):
```bash
powershell -Command "& { Invoke-WebRequest -Uri 'https://app.harness.io/public/shared/tools/chaos/windows/1.56.0/install.ps1' -OutFile 'install.ps1' -UseBasicParsing; .\install.ps1 -AdminUser '.\' -AdminPass '' -InfraId '' -AccessKey '' -ServerUrl 'https://app.harness.io/gratis/chaos/mserver/api' }"
```
Notes:
* `.\` in `AdminUser` indicates a local account. For a domain account, replace it with the domain.
* If the VM is behind a proxy, append `-HttpsProxy ` `-HttpProxy ` `-NoProxy ` to the install command.
### Verify the upgrade
```bash
sc query WindowsChaosInfrastructure
```
You can also confirm the version from **Resilience Testing → Project Settings → Resilience Testing Infrastructures → Windows**.
