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title: Mule Upgrade Tool 1.1.9 Release Notes
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# Mule Upgrade Tool 1.1.9 Release Notes

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

The Mule upgrade tool is a command line utility for updating and upgrading standalone instances of
the Mule 4 runtime engine that are hosted on-premises. The tool can upgrade any supported Mule 4
version (minor, patch, or patch update versions) to a new version.

MuleSoft recommends upgrading to the latest version of Mule.

To incorporate the latest changes and bug fixes, MuleSoft also recommends using the latest version
of the tool.

## September 23, 2026

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Application/Service</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.1 and later</p></td></tr></tbody></table>

### Fixed Issues

<table><colgroup><col> <col></colgroup><thead><tr><th>Issue Resolution</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p><code>wrapper-additional.conf</code> is now regenerated after an upgrade.</p></div></div></td><td><div><div><p>W-23159037</p></div></div></td></tr><tr><td><div><div><p>Mule distribution paths with spaces and relative paths now work as expected.</p></div></div></td><td><div><div><p>W-21964600</p></div></div></td></tr><tr><td><div><div><p>Obsolete unzipped server-plugin directories are now removed during an upgrade.</p></div></div></td><td><div><div><p>W-24212237</p></div></div></td></tr></tbody></table>

## See Also

- [Mule Upgrade Tool](https://docs.mulesoft.com/mule-runtime/latest/mule-upgrade-tool)

- [Known Issues](https://help.salesforce.com/s/issues)