--- title: 1.99.0 pre-release testing | daily.dev description: Rust 1.99.0 is in pre-release testing ahead of its scheduled October 1 release. Developers can opt into the pre-release build locally via rustup with a custom... canonical: https://daily.dev/posts/1-99-0-pre-release-testing-bwskr3h9v twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: 1.99.0 pre-release testing | daily.dev og:description: Rust 1.99.0 is in pre-release testing ahead of its scheduled October 1 release. Developers can opt into the pre-release build locally via rustup with a custom... og:url: https://daily.dev/posts/1-99-0-pre-release-testing-bwskr3h9v og:image: https://api.daily.dev/og/posts/BWsKr3h9V.png og:image:alt: 1.99.0 pre-release testing og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # 1.99.0 pre-release testing **[Inside Rust Blog](https://daily.dev/sources/insiderustblog)** · 1 min read · 0 upvotes · 0 comments ## Summary Rust 1.99.0 is in pre-release testing ahead of its scheduled October 1 release. Developers can opt into the pre-release build locally via rustup with a custom dist server, review release notes, and submit feedback through the internals forum thread or a GitHub issue tracking the pre-release process itself. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do I test the Rust 1.99.0 pre-release before it ships? Set the RUSTUP_DIST_SERVER environment variable to https://dev-static.rust-lang.org and run rustup update stable. This pulls the pre-release build from the dev static server ahead of the official October 1 release, letting you validate your code against it early. Release notes are published alongside the pre-release index for reference. _Developers testing against upcoming toolchains can follow compiler changes like this on daily.dev._ ## Similar posts on daily.dev - [1.97.0 pre-release testing](https://daily.dev/posts/1-97-0-pre-release-testing-ihzhs2w9w) · Inside Rust Blog · 23 upvotes · 0 comments - [1.96.1 pre-release testing](https://daily.dev/posts/1-96-1-pre-release-testing-dvfxovhxg) · Inside Rust Blog · 19 upvotes · 2 comments - [Announcing Rust 1.96.1](https://daily.dev/posts/announcing-rust-1-96-1-55arhlmt6) · Rust · 21 upvotes · 1 comments --- Tags: [#rust](https://daily.dev/tags/rust) [View this post on daily.dev](https://daily.dev/posts/1-99-0-pre-release-testing-bwskr3h9v) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"1.99.0 pre-release testing","url":"https://daily.dev/posts/1-99-0-pre-release-testing-bwskr3h9v","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/1-99-0-pre-release-testing-bwskr3h9v"},"datePublished":"2026-10-01T12:46:39.011Z","dateModified":"2026-10-01T13:30:39.682Z","description":"Rust 1.99.0 is in pre-release testing ahead of its scheduled October 1 release. 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