Domino Nexus only allows control planes and data planes to be out of sync by patch version. For instance, 5.5.0 and 5.5.1 are acceptable, but 5.5.0 and 5.6.0 are not.
If your control plane has been upgraded, but the data planes have not, they are marked as degraded in the Admin UI, and new executions are not permitted.
How to upgrade a data plane
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Generate a new Helm install command using the details of the existing data plane.
The new command will use the new chart version.
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This upgrades the data plane agent and other Domino platform services.