Crystal 1.19.0 released!

NewsBot · 15 January 2026 19:24

Crystal 1.19.0 has been released.

Breaking changes

stdlib

(crypto) Require OpenSSL 1.1.1+ or LibreSSL 3+ (#16480, thanks @ysbaddaden)

Features

lang

(macros) [breaking] Add compiler flag values (#16310, thanks @straight-shoota)

(macros) Add yielding variant of StringLiteral#gsub (#16378, thanks @Blacksmoke16)

(macros) Support StringLiteral#split(RegexLiteral) (#16423, thanks @HertzDevil)

(macros) Add StringLiteral#match (#16464, thanks @HertzDevil)

(macros) Make all overloads of ArrayLiteral#[] return nil on out of bounds (#16453, thanks @HertzDevil)

stdlib

(collection) Add NamedTuple#reverse_merge ([#16229], thanks @andrykonchin)

(collection) Pad Hash#inspect, Tuple#inspect before { from first element ([#16245], thanks @andrykonchin)

(collection) Add Set#map! ([#16271], thanks @andrykonchin)

(collection) Add Hash#transform_keys! ([#16280], thanks @andrykonchin)

(collection) Enhance error message for Hash#[] when key is wrong type for default block ([#16442], thanks @Blacksmoke16)

(concurrency) Add Sync::Mutex and Sync::RWLock ([#16399], thanks @ysbaddaden)

(concurrency) Add Sync::ConditionVariable ([#16440], thanks @ysbaddaden)

(concurrency) Import Sync::Exclusive and Sync::Shared ([#16487], thanks @ysbaddaden)

(crypto) Add OpenSSL::SSL::Context::Server#on_server_name for SNI ([#16452], [#16525], thanks @carlhoerberg, @straight-shoota)

(networking) Loosen type restrictions in StaticFileHandler helper methods from File to IO ([#16238], thanks @andrykonc…

Link: Release 1.19.0 · crystal-lang/crystal · GitHub