# Description

Latest URDF importer in Isaac Sim 5.1 removed the support for
merge-joints, which caused a breaking change for some users. Although
this will maintain as the behavior going forward, we are updating the
importer version to a patch fix of the URDF importer for the short term
that still provides the merge-joints support.

In the future, we will look into providing more tooling for supporting
similar behaviors in addition to the importer itself.

Fixes #3943 


## Type of change

- Bug fix (non-breaking change which fixes an issue)
- Breaking change (existing functionality will not work without user
modification)

## Checklist

- [x] I have read and understood the [contribution
guidelines](https://isaac-sim.github.io/IsaacLab/main/source/refs/contributing.html)
- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [ ] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there

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Signed-off-by: Kelly Guo <kellyg@nvidia.com>