railpack v0.27.0

Providers

Fixed

• Elixir: Elixir 1.20 now maps to Erlang 29, so projects on Elixir 1.20 build with the correct OTP version. by @iloveitaly in https://github.com/railwayapp/railpack/pull/583

CLI

New

• Mise: Updated mise version from v2026.6.0 to v2026.6.1.

Runtime

• Locale: Builder and runtime images now include the en_US.UTF-8 locale, fixing warnings and breakage for apps that depend on locale-aware behavior (such as Python or Ruby). Railpack does not set LANG or LC_ALL by default — enable UTF-8 by adding them to deploy.variables in your railpack.json (for example, "LANG": "en_US.UTF-8"). by @iloveitaly in https://github.com/railwayapp/railpack/pull/576
• Timezone: Builder and runtime images now include tzdata by default, so named timezones work out of the box when you set TZ or use libraries that read the zoneinfo database. by @iloveitaly in https://github.com/railwayapp/railpack/pull/580

Full Changelog: https://github.com/railwayapp/railpack/compare/v0.26.1...v0.27.0

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Internal improvements to testing, documentation, dependency updates, and development tooling by @iloveitaly