Racket v9.1

posted by Stephen De Gabrielle and John Clements

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We are pleased to announce Racket v9.1 is now available from https://download.racket-lang.org/.

As of this release:

• Documentation organization and navigation can be specialized by language family, to allow users to interact with documentation in a way that is tailored to that language family. This is currently used by Rhombus.
• The for form and its variants accept an #:on-length-mismatch specifier. 3.18 Iterations and Comprehensions: for, for/list, …
• DrRacket improves the GUI for choosing color schemes.
• DrRacket has curved syntax arrows. The degree of curvature indicates the relative left- or right-displacement of the arrow’s target.
• DrRacket’s “Insert Large Letters” uses characters that match the comment syntax of the buffer’s language, making it useful (and fun!) in Rhombus.
• The exn-classify-errno maps network and filesystem error numbers on various platforms to posix-standard symbols, to enable more portable code. 10.2 Exceptions
• The behavior of Racket BC on certain character operations (most notably eq?) is changed to match that of Racket CS, with a small performance penalty for these operations for BC programs. 19 Performance 1.5 Implementations
• The make-struct-type procedure can inherit the current inspector using a 'current flag. This is the default behavior, but there are situations in which it’s not possible to refer to the current inspector. 5.2 Creating Structure Types
• Bundle configurations can better control the conventions for locating shared object files with the --enable-sofind=<conv> flags.
• The system-type function can report on platform and shared-object-library conventions with new flags. 15.8 Environment and Runtime Information
• The openssl/legacy library makes it possible to access OpenSSL’s built-in “legacy” provider, to get access to insecure and outdated algorithms. OpenSSL: Secure Communication
• Typed Racket improves expected type propagation for keyword argument functions.
• There are many other repairs and documentation improvements!

Don’t forget to run raco pkg migrate 9.0

Thank you

The following people contributed to this release:

Alexander Shopov, beast-hacker, Bob Burger, Brad Lucier, Cadence Ember, David Van Horn, evan, François-René Rideau, Gustavo Massaccesi, Jacqueline Firth, Jade Sailor, Jason Hemann, Jens Axel Søgaard, John Clements, Jonas Rinke, Matthew Flatt, Matthias Felleisen, Mike Sperber, Noah Ma, Pavel Panchekha, Rob Durst, Robby Findler, Ryan Culpepper, Sam Tobin-Hochstadt, Stephen De Gabrielle, and Wing Hei Chan.

Racket is a community developed open source project and we welcome new contributors. See racket/README.md to learn how you can be a part of this amazing project.

Feedback Welcome

Questions and discussion welcome at the Racket community on Discourse or Discord.

If you can - please help get the word out to users and platform specific repo packagers

Racket - the Language-Oriented Programming Language - version 9.1 is now available from https://download.racket-lang.org

See https://blog.racket-lang.org/2026/02/racket-v9-1.html for the release announcement and highlights.