Helm complains about incompatible kubernetes version

Whenever I try helm upgrade longhorn longhorn/longhorn --dry-run I end up with the following error.

Error: UPGRADE FAILED: chart requires kubeVersion: >=v1.18.0 which is incompatible with Kubernetes v1.21.5-3+e8b6c7dca47a08

This looks odd since 1.21.5-3… is definitely newer than 1.18.0. Does anyone know a workaround or a fix?
Thanks for your help!

Looking at the error, do u have the latest longhorn chart?
This charts/Chart.yaml at master · longhorn/charts · GitHub shows its version 1.18.0-0 which will pass the semver comparison to 1.21.5-3...