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Wheels 4.0 is out.

260+ PRs over ~15 weeks since 3.0.0, ~75 user-visible features, 40+ security-hardening PRs, 7 breaking changes (all with detect/fix/opt-out docs).

Headlines:
• `wheels deploy` — Kamal-style zero-downtime deploys over SSH (no Ruby needed)
• Data layer — bulk insert/upsert, polymorphic assocs, advisory locks, CockroachDB adapter, chainable query builder, enums, scopes
• Testing — Playwright Java browser testing, HTTP test client, parallel runner
• Multi-tenancy — in-core, per-request datasource switching
• Background jobs — DB-backed, zero Redis, live dashboard
• Security — 40+ hardening PRs, secure-by-default
• DX — LuCLI zero-Docker inner loop, ~60s test suite, CI matches local

Upgrade guide: &lt;<https://guides.wheels.dev/v4-0-0/upgrading/3x-to-4x/>&gt;
CHANGELOG: &lt;<https://github.com/wheels-dev/wheels/blob/develop/CHANGELOG.md|CHANGELOG.md>&gt;

Thanks to @bpamiri, @zainforbjs, <@U06TYEBLN>, @mlibbe, @MukundaKatta, and dependabot for the work that landed this release.

&lt;<https://blog.wheels.dev/posts/wheels-4-closing-the-maturity-gap/|Read the full post>&gt;