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
| Application/Service | Version |
|---|---|
Mule |
4.1.1 and later |
Fixed Issues
| Issue Resolution | ID |
|---|---|
|
W-23159037 |
Mule distribution paths with spaces and relative paths now work as expected. |
W-21964600 |
Obsolete unzipped server-plugin directories are now removed during an upgrade. |
W-24212237 |