Who contributed to Elixir & Phoenix on August 3, 2026?

3 developers shipped this update, including rhcarvalho, dependabot, and lukaszsamson.

What were the notable Elixir & Phoenix updates?

Only use `async: true` for ConnCase error tests on Postgres/no-Ecto, Only use async: true for ConnCase error tests on Postgres and no-Ecto apps (#6783), and Normalize DateTime casts to UTC.

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The Wire · Showcase

SQLITE TEST FLAKES FIXED, DATETIME CASTING BREAKING CHANGE LANDS

By RepoJournal · Filed 07:00 UTC on August 3, 2026 · About Elixir & Phoenix

3 people shipped this

rhcarvalho @rhcarvalho 4 cited

dependabot @dependabot 2 cited

lukaszsamson @lukaszsamson 1 cited

Phoenix killed a long-standing SQLite test flakey that has haunted generated apps since day one, while Ecto ships a backward-incompatible DateTime normalization that tightens UTC handling.

Phoenix fixed a critical issue where generated error test files hardcoded `async: true` for SQLite apps, causing intermittent "Database busy" failures during `mix test` [1]. The root cause: ConnCase's setup block calls DataCase.setup_sandbox on Ecto-enabled apps, which SQLite cannot handle under concurrent test execution. The fix disables async mode only for SQLite with Ecto, leaving Postgres and no-Ecto apps running tests in parallel [2]. In parallel work, Ecto merged a backward-incompatible change that normalizes all DateTime casts to UTC before storing in naive datetime or date fields [3], addressing edge cases where non-UTC DateTime structs would silently corrupt data. This should not affect Phoenix-generated CRUD pages, but apps that deliberately pass timezone-aware datetimes to date fields will break. On the template front, Elixir cleaned up trailing whitespace and double newlines in files generated by `mix new` [4] [5], preventing Git from flagging formatting errors under strict whitespace configuration. Dependabot bumped jsdom to 30.0.1 and eslint to 10.8.0 across the Phoenix stack [6] [7].

Action items

→ Regenerate test files if you maintain a generated Phoenix+SQLite app, or cherry-pick the async fix from #6783 phoenixframework/phoenix [plan]
→ Audit datetime fields before upgrading Ecto if you pass non-UTC DateTime structs to naive datetime columns elixir-ecto/ecto [plan]
→ Run `mix new` on fresh projects to get clean template formatting elixir-lang/elixir [monitor]

References

[1] Only use `async: true` for ConnCase error tests on Postgres/no-Ecto ↗ phoenixframework/phoenix
[2] Only use async: true for ConnCase error tests on Postgres and no-Ecto apps (#6783) phoenixframework/phoenix
[3] Normalize DateTime casts to UTC ↗ elixir-ecto/ecto
[4] Ensure no double newlines in files generated by "mix new" ↗ elixir-lang/elixir
[5] Fix trailing whitespace in files generated by "mix new" ↗ elixir-lang/elixir
[6] Bump jsdom from 29.1.1 to 30.0.1 ↗ phoenixframework/phoenix
[7] Bump the minor-and-patch group with 2 updates ↗ phoenixframework/phoenix

Quick answers

What shipped in Elixir & Phoenix on August 3, 2026?: Phoenix killed a long-standing SQLite test flakey that has haunted generated apps since day one, while Ecto ships a backward-incompatible DateTime normalization that tightens UTC handling. In total, 4 commits and 8 pull requests landed.
Who contributed to Elixir & Phoenix on August 3, 2026?: 3 developers shipped this update, including rhcarvalho, dependabot, and lukaszsamson.
What were the notable Elixir & Phoenix updates?: Only use `async: true` for ConnCase error tests on Postgres/no-Ecto, Only use async: true for ConnCase error tests on Postgres and no-Ecto apps (#6783), and Normalize DateTime casts to UTC.

ELIXIR BUMPS ZIZMOR SECURITY SCANNER TO 1.28.0

The Elixir repo updated its CI security action overnight, pulling in the latest zizmor static analysis tooling.

elixir 1 shipped

Elixir & Phoenix Aug 5

ELIXIR 1.20.3 TIGHTENS TYPE CHECKING, PHOENIX CUTS AGENT GUIDANCE BLOAT

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elixir 5 shipped

Elixir & Phoenix Aug 4

PHOENIX TIGHTENS OUTPUT FORMATTING WHILE ELIXIR PATCHES DEPRECATION DOCS

Phoenix now enforces single trailing newlines in generated files to eliminate code churn, while the Elixir team corrects documentation errors in core modules.

elixir 14 shipped

Elixir & Phoenix Aug 2

ELIXIR CUTS DURATION PARSING AND TUPLE MATH OVERHEAD

Two core optimizations shipped overnight eliminate redundant passes and stack allocations across Calendar and tuple operations.

elixir 4 shipped

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