Traefik v3.6.15 released on 29-04-2026
Traefik v3.6.15 is out now. Operators and administrators should read the migration guide before upgrading to avoid configuration and behaviour changes that could disrupt deployments.
See the migration guide at https://doc.traefik.io/traefik/migrate/v3/#v3615 and the release notes on the project’s GitHub for full details.
What’s in this release
- Important migration note and guide for v3.6.15 — check configuration and behaviour changes before upgrading.
- ACME client library bumped: github.com/go-acme/lego/v4 upgraded first to v4.35.1 and then to v4.35.2 to bring ACME-related bugfixes and improvements.
- Errors middleware: new errorRequestHeaders option to set request headers when handling error responses.
Upgrade notes
- Read the migration guide at https://doc.traefik.io/traefik/migrate/v3/#v3615 and verify any changed configuration or behaviour before rolling out the upgrade.
- If you need to revert, use the previous release tag on the project’s GitHub releases to downgrade and then investigate the breaking change noted in the migration guide.
Share your experience with the upgrade in the project’s GitHub issues or community channels so others can learn from any problems or fixes you encounter.
