Crystal Language on X: "A new release is out: Crystal 1.21.0 🚀 We've reached a major milestone with making Execution Contexts the default concurrency model. https://t.co/oprIVAzAOf Read more about the release at https://t.co/UBJ19ydIT6 #crystallang #release"

Crystal Language

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A new release is out: Crystal 1.21.0 🚀 We've reached a major milestone with making Execution Contexts the default concurrency model. crystal-lang.org/2026/07/12/rel… Read more about the release at crystal-lang.org/2026/07/16/1.2… #crystallang #release

crystal-lang.org

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).

8:59 PM · Jul 16, 2026·

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