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Update Hermes safely

Purpose

Update Hermes to a newer release without losing configuration, skills, or sessions.

Symptoms that match this runbook

User wants to move to a newer Hermes version
hermes version shows an older build than expected
Update-related errors after manual changes in the install directory

Prerequisites

Hermes install method: git-based install at /home/hermes/.hermes/hermes-agent
Working Python virtualenv at /home/hermes/.hermes/hermes-agent/venv
Available disk space in Hermes install and backup paths
No active Hermes chat/webui shell issues before starting

Procedure

1. Create a backup first

hermes backup --quick --label pre-update-$(date +%Y%m%d)

If you need a full backup instead:

hermes backup --label pre-update-$(date +%Y%m%d)

2. Check whether an update is available

hermes update --check

3. Review configuration version and backups

python3 -c "import yaml; print(yaml.safe_load(open('/home/hermes/.hermes/config.yaml')).get('_config_version'))"
ls -la ~/.hermes/config.yaml.bak*

4. Run the update with noninteractive flags

cd /home/hermes/.hermes/hermes-agent
git status --short
hermes update --yes --branch main

5. Verify the new version

hermes version

6. Restart the required Hermes pieces

hermes gateway status
hermes dashboard status
hermes gateway restart
hermes dashboard restart

7. Sanity check health

hermes gateway status
curl -s -o /dev/null -w "%{http_code}" http://127.0.0.1:8787/health

Verification

hermes version shows a newer version than before
hermes gateway status is active
WebUI /health returns 200
Providers reachable with provider-health

Rollback

Rollback Hermes config:

ls -lt ~/.hermes/config.yaml.bak*
cp ~/.hermes/config.yaml.bak.<timestamp> ~/.hermes/config.yaml
hermes gateway restart
hermes dashboard restart

Rollback entire Hermes install requires git revert or reinstall from previous checkout
If update warns about config migration, revert the backup and re-run manually

Notes

Hermes version on this install: v0.19.0 (2026.7.20)
Install directory: /home/hermes/.hermes/hermes-agent
Update preserves venv by default unless --force-venv is used

Last tested

2026-07-22 on debian 13, git-based Hermes install

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