Crystal 1.21.1 released!

NewsBot · 26 September 2026 12:23

Crystal 1.21.1 has been released.

Bugfixes

stdlib

(collection) [regression] Override Channel#tap(&) to reinstate original behaviour (#17296, thanks @straight-shoota)

(networking) [security] Fix HTTP::Request::Processor resuming connection on unconsumed request (#17434, thanks @straight-shoota)

(networking) Fix non-blocking Socket#connect on Unix (#17436, thanks @ysbaddaden)

(networking) [security] Fix HTTP::Server::RequestProcessor to consume request body before upgrade (#17466, thanks @straight-shoota)

(networking) [security] Fix do not automatically decompress HTTP request body (#17476, thanks @straight-shoota)

(serialization) Fix XML::Node#namespace for node types without namespace (#17435, thanks @straight-shoota)

(serialization) Fix YAML::Any#hash with self-referencing containers (#17477, thanks @straight-shoota)

Infrastructure

Add changelog for 1.21.1 (#17478, thanks @straight-shoota)

Update distribution-scripts (#17480, thanks @straight-shoota)

Link: Release 1.21.1 · crystal-lang/crystal · GitHub