---
title: "Elixir v1.20.0 released"
url: https://daily.dev/posts/elixir-v1-20-0-released-7hyajmuxu
source_url: https://elixirforum.com/t/elixir-v1-20-0-released/75566
type: article
source: "Elixir Forum"
published: 2026-06-03T18:54:50.091Z
updated: 2026-06-04T02:15:16.631Z
tags: ["elixir", "erlang", "general-programming"]
reading_time: 11
upvotes: 1
comments: 0
language: en
---

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# Elixir v1.20.0 released

**[Elixir Forum](https://daily.dev/sources/elixirforum)** · 11 min read · 1 upvotes · 0 comments

## Summary

Elixir v1.20.0 is released, requiring Erlang/OTP 27+ and compatible with OTP 29. The headline feature is a major type system overhaul: the type system now understands all language constructs and can infer types for function definitions without requiring explicit type signatures. Key improvements include type inference from guards, whole-body type inference, typing across clauses (occurrence typing for case/cond/with), and full support for non-atom map keys using domain-based typing. Map operations in the Map module are now fully typed, enabling detection of missing or invalid key accesses across module boundaries. Compile-time performance is also improved, with a new :interpreted module_definition option that can significantly speed up compilation on multi-core machines. Additional enhancements span ExUnit, IEx, Mix (dry-run for tests, parallelized dep checks), and the standard library (new Integer functions, SWAR optimizations, etc.). Several hard deprecations are introduced for Logger backends and other APIs.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://elixirforum.com/t/elixir-v1-20-0-released/75566>

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---

Tags: [#elixir](https://daily.dev/tags/elixir), [#erlang](https://daily.dev/tags/erlang), [#general-programming](https://daily.dev/tags/general-programming)

[View this post on daily.dev](https://daily.dev/posts/elixir-v1-20-0-released-7hyajmuxu)