We are announcing a new Crystal release 1.20.3 with fixes for two security vulnerabilities in the YAML parsers. We recommend upgrading as soon as possible if your application processes YAML files from unknown origins. See the release notes of 1.20.0 for all the changes introduced in Crystal 1.20. Pr...

We are announcing a new Crystal release 1.21.0 with several new features and bug fixes. Pre-built packages are available on GitHub Releases and our official distribution channels. See crystal-lang.org/install for installation instructions. Stats Section titled Stats This release includes 161 changes...

Two and a half years ago, with the invaluable support from 84codes, we re-examined the multithreading model inherited from Crystal 0.28 (preview MT). There are different ways to spread an application to multiple CPU cores. So far, preview MT proposed a simple solution, and it worked great for many c...

We are announcing a new Crystal release 1.20.3 with fixes for two security vulnerabilities in the YAML parsers. We recommend upgrading as soon as possible if your application processes YAML files from unknown origins. See the release notes of 1.20.0 for all the changes introduced in Crystal 1.20. Pr...

On 12 April 2026, we received a vulnerability report regarding an HTTP request smuggling vulnerability in HTTP::Server. The issue was caused by the HTTP request parser prioritizing the Content-Length header over the Transfer-Encoding header, which can lead to desynchronization when a proxy that prio...

We are announcing a new Crystal release 1.20.2 with a couple of regressions fixed. See the release notes of 1.20.0 for all the changes introduced in Crystal 1.20. Pre-built packages are available on GitHub Releases and our official distribution channels. See crystal-lang.org/install for installation...

We are announcing a new Crystal release 1.20.1 with a couple of regressions fixed. See the release notes of 1.20.0 for all the changes introduced in Crystal 1.20. Pre-built packages are available on GitHub Releases and our official distribution channels. See crystal-lang.org/install for installation...

We are announcing a new Crystal release 1.19.2 with two regressions fixed. See the release notes of 1.19.0 for all the changes introduced in Crystal 1.19. Pre-built packages are available on GitHub Releases and our official distribution channels. See crystal-lang.org/install for installation instruc...

We are announcing a new Crystal release 1.20.0 with several new features and bug fixes. Pre-built packages are available on GitHub Releases and our official distribution channels. See crystal-lang.org/install for installation instructions. Stats Section titled Stats This release includes 161 changes...

This has been a long awaited feature: how to run Crystal on ARM64 CPUs? Crystal has supported ARM64 as a tier 1 architecture for many years now, and we already distribute an universal build for macOS, but still no ARM64 builds for Linux. The wait is over! During the development of Crystal 1.19 we bo...

I’m giving a talk about Crystal at FOSDEM 2026 in Brussels: Crystal: A language for humans and computers. It’s in the Declarative and Minimalistic Computing track, on Sunday, 1 February 2026 at 09:00 in room UB4.136. The talk is going to be an introduction into some concepts of Crystals. If you are ...

We are announcing a new Crystal release 1.19.1 with two regressions fixed. See the release notes of 1.19.0 for all the changes introduced in Crystal 1.19. Pre-built packages are available on GitHub Releases and our official distribution channels. See crystal-lang.org/install for installation instruc...

We are announcing a new Crystal release 1.19.0 with several new features and bug fixes. Pre-built packages are available on GitHub Releases and our official distribution channels. See crystal-lang.org/install for installation instructions. Stats Section titled Stats This release includes 237 changes...

We are announcing a new Crystal release 1.18.2 with two regressions fixed. See the release notes of 1.18.0 for all the changes introduced in Crystal 1.18. Pre-built packages are available on GitHub Releases and our official distribution channels. See crystal-lang.org/install for installation instruc...

We are announcing a new Crystal release 1.18.1 with two regressions fixed. See the release notes of 1.18.0 for all the changes introduced in Crystal 1.18. Pre-built packages are available on GitHub Releases and our official distribution channels. See crystal-lang.org/install for installation instruc...

We are announcing a new Crystal release 1.18.0 with several new features and bug fixes. Pre-built packages are available on GitHub Releases and our official distribution channels. See crystal-lang.org/install for installation instructions. Stats Section titled Stats This release includes 172 changes...

My time at Manas is coming to an end, though I will remain a Core Team member and continue to help develop the project from that seat. Johannes (@straight-shoota) will be taking on the leading role of the project. Please join me in congratulating him on his new position! While this might sound like ...

We are announcing a new Crystal release 1.17.1 with a regression bug fix. Pre-built packages are available on GitHub Releases and our official distribution channels. See crystal-lang.org/install for installation instructions. Stats Section titled Stats This release includes 2 changes since 1.17.0 by...

We are announcing a new Crystal release 1.17.0 with several new features and bug fixes. Pre-built packages are available on GitHub Releases and our official distribution channels. See crystal-lang.org/install for installation instructions. Stats Section titled Stats This release includes 187 changes...

Manas.Tech, the company behind Crystal, launches a new service: Crystal Compass is a paid subscription that offers technical support and code reviews from the creators of the Crystal language. This is a service for people who use, or prepare to use, Crystal in production. Our support service pairs p...