The GHC developers are very pleased to announce the release of GHC 9.14.1. Binary distributions, source distributions, and documentation are available at [downloads.haskell.org][].
GHC 9.14 brings a number of new features and improvements, including:
* Significant improvements in specialisation:
* The `SPECIALISE` pragma now allows use of type application syntax
* The `SPECIALISE` pragma can be used to specialise for expression arguments
as well as type arguments.
* Specialisation is now considerably more reliable in the presence of
`newtype`s
* Significant GHCi improvements including:
* Correctness and performance improvements in the bytecode interpreter
* Features in the GHCi debugger
* Support for multiple home units in GHCi
* Implementation of the [Explicit Level Imports proposal][levels]
* `RequiredTypeArguments` can now be used in more contexts
* Greatly improved [SSE/AVX2 support][sse] in the x86 native code generator
backend
* Initial native code generator support for LoongArch
* The WebAssembly backend now supports [evaluation via the
interpreter][wasm-ghci], allowing
GHCi and TemplateHaskell evaluation, including `foreign import javascript`
usage from within the browser
* A new primop [`annotateStack#`][annotate-stack] for pushing arbitrary data
onto the call stack
for later extraction when decoding stack traces
* [`-Wincomplete-record-selectors`][incomplete-selectors] is now part of
`-Wall`. Libraries compiled
with `-Werror` may need adjustment.
* A major update of the Windows toolchain
* Improved compatibility with [macOS Tahoe][macos]
* ... and many more
A full accounting of changes can be found in the [release notes][].
See the [migration guide][] for guidance on migrating programs to this release.
Note that while this release makes many improvements in the specialisation
optimisation, polymorphic specialisation remains disabled by default in the
release due to concern over regressions of the sort identified in
[#26329][T26329]. Users needing more aggressive specialisation can explicitly
enable this feature with the `-fpolymorphic-specialisation` flag. Depending
upon our experience with 9.14.1, we may enable this feature by default in a
later minor release.
GHC development is sponsored by:
* [Juspay](https://juspay.com/)
* [QBayLogic](https://qbaylogic.com/)
* [Channable](https://www.channable.com/)
* [Haskell Foundation](https://haskell.foundation/)
* [Serokell](https://serokell.io/)
* [Well-Typed](https://well-typed.com/)
* [Tweag](https://www.tweag.io/)
* [Dotcom-Monitor](https://www.dotcom-monitor.com/)
* [LoadView](https://www.loadview-testing.com/)
* [Web Hosting Buddy](https://webhostingbuddy.com/)
* [Find My Electric](https://www.findmyelectric.com/)
* [Standard Chartered](https://www.sc.com)
* [UpCloud](https://upcloud.com)
We would like to thank these sponsors and other anonymous contributors
whose on-going financial and in-kind support has facilitated GHC maintenance
and release management over the years. Finally, this release would not have
been possible without the hundreds of open-source contributors whose work
comprises this release.
As always, do give this release a try and open a [ticket][] if you see
anything amiss.
[downloads.haskell.org]: https://downloads.haskell.org/ghc/9.14.1
[release notes]:
https://downloads.haskell.org/ghc/9.14.1/docs/users_guide/9.14.1-notes.html
[ticket]: https://gitlab.haskell.org/ghc/homepage/-/issues/new
[macos]: https://gitlab.haskell.org/ghc/ghc/-/issues/26166
[T26329]: https://gitlab.haskell.org/ghc/ghc/-/issues/26329
[levels]:
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0682-explicit-level-imports.rst
[wasm-ghci]: https://www.tweag.io/blog/2025-04-17-wasm-ghci-browser/
[incomplete-selectors]:
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0516-incomplete-record-selectors.rst
[annotate-stack]: https://gitlab.haskell.org/ghc/ghc/-/issues/26218
[migration guide]: https://gitlab.haskell.org/ghc/ghc/-/wikis/migration/9.14
[sse]: https://gitlab.haskell.org/ghc/ghc/-/issues/25030
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