The core team has tagged mandatory release v1.15.6.
This release includes a patch to fix a latent bug in environments where multiple validator instances may be running on the same machine causing a resource exhaustion (due to too many open files on the server).
Validator operators are requested to upgrade to v1.15.6 without delay. Failure to upgrade could result in another chain halt.
Validators can directly update to v1.15.6 from v1.14.0 or above.
The latest tags have been updated to v1.15.6.
Besides the patch, this release includes all the updates from 1.15.5: https://github.com/helium/miner/releases/tag/validator1.15.5