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Overview
Crystal is a general-purpose, object-oriented programming language. With syntax inspired by Ruby, it’s a compiled language with static type-checking. Types are resolved by an advanced type inference algorithm.
News
Crystal 1.21.0 is released!
We are announcing a new Crystal release 1.21.0 with several new features and bug fixes.
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Releasing Execution Contexts
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).
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Crystal 1.20.3 is released!
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.
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Post Mortem: HTTP Request Smuggling Vulnerability
On 12 April 2026, we received a vulnerability report regarding an HTTP request smuggling vulnerability in HTTP::Server.
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Crystal 1.20.2 is released!
We are announcing a new Crystal release 1.20.2 with a couple of regressions fixed.
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