# GHC 9.4.5 is now available

**URL:** <https://discourse.haskell.org/t/ghc-9-4-5-is-now-available/6164>\
**Category:** Announcements\
**Created:** [April 18, 2023, 1:56pm UTC](https://discourse.haskell.org/t/ghc-9-4-5-is-now-available/6164 "2023-04-18T13:56:55Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![wz1000](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.haskell.org/wz1000/32/1245_2.png) [@wz1000](https://discourse.haskell.org/u/wz1000)\
**Post date:** [April 18, 2023, 1:56pm UTC](https://discourse.haskell.org/t/ghc-9-4-5-is-now-available/6164/1 "2023-04-18T13:56:55Z")

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The GHC developers are happy to announce the availability of GHC 9.4.5. Binary  
distributions, source distributions, and documentation are available at  
[downloads.haskell.org](https://downloads.haskell.org/ghc/9.4.5).

Download Page: [GHC 9.4.5 download — The Glasgow Haskell Compiler](https://www.haskell.org/ghc/download_ghc_9_4_5.html)  
Blog Post: [GHC 9.4.5 is now available — The Glasgow Haskell Compiler](https://www.haskell.org/ghc/blog/20230418-ghc-9.4.5-released.html)

This release is primarily a bugfix release addressing a few issues  
found in 9.4.4. These include:

- Fixes for a number of bugs in the simplifier (#22623, #22718, #22913, 22695,  
#23184, #22998, #22662, #22725).
- Many bug fixes to the non-moving and parallel GCs (#22264, #22327, #22926,  
#22927, #22929, #22930, #17574, #21840, #22528)
- A fix a bug with the alignment of RTS data structures that could result in  
segfaults when compiled with high optimisation settings on certain platforms  
(#22975 , #22965).
- Bumping `gmp-tarballs` to a version which doesn’t use the reserved `x18`  
register on AArch64/Darwin systems, and also has fixes for CVE-2021-43618  
(#22497, #22789).
- A number of improvements to recompilation avoidance with multiple home units  
(#22675, #22677, #22669, #22678, #22679, #22680)
- Fixes for regressions in the typechecker and constraint solver (#22647,  
#23134, #22516, #22743)
- Easier installation of binary distribution on MacOS platforms by changing the  
installation Makefile to remove the quarantine attribute when installing.
- … and many more. See the [release notes](https://downloads.haskell.org/~ghc/9.4.5/docs/users_guide/9.4.5-notes.html) for a full accounting.

As some of the fixed issues do affect correctness users are encouraged to  
upgrade promptly.

We would like to thank Microsoft Azure, GitHub, IOG, the Zw3rk stake pool,  
Well-Typed, Tweag I/O, Serokell, Equinix, SimSpace, Haskell Foundation, 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 comprise this release.

As always, do give this release a try and open a [ticket](https://gitlab.haskell.org/ghc/ghc/-/issues/new) if you see  
anything amiss.

Happy compiling,

- Zubin

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**Author:** ![janus](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.haskell.org/janus/32/1060_2.png) [@janus](https://discourse.haskell.org/u/janus)\
**Post date:** [April 18, 2023, 2:01pm UTC](https://discourse.haskell.org/t/ghc-9-4-5-is-now-available/6164/2 "2023-04-18T14:01:54Z")

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The link to the release notes which are supposed to be at [https://downloads.haskell.org/~ghc/9.4.5/docs/html/users\_guide/9.4.5-notes.html](https://downloads.haskell.org/~ghc/9.4.5/docs/html/users_guide/9.4.5-notes.html) is not working

The working link is [2.1. Version 9.4.5 — Glasgow Haskell Compiler 9.4.5 User's Guide](https://downloads.haskell.org/~ghc/9.4.5/docs/users_guide/9.4.5-notes.html)

EDIT: Also, the link to the download page should be [GHC 9.4.5 download — The Glasgow Haskell Compiler](https://www.haskell.org/ghc/download_ghc_9_4_5.html) (with underscores). The one with dots gives a HTTP 500 error code.

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**Author:** ![wz1000](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.haskell.org/wz1000/32/1245_2.png) [@wz1000](https://discourse.haskell.org/u/wz1000)\
**Post date:** [April 18, 2023, 2:07pm UTC](https://discourse.haskell.org/t/ghc-9-4-5-is-now-available/6164/3 "2023-04-18T14:07:14Z")

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> [@janus](#):
>
> [https://downloads.haskell.org/~ghc/9.4.5/docs/html/users\_guide/9.4.5-notes.html](https://downloads.haskell.org/~ghc/9.4.5/docs/html/users_guide/9.4.5-notes.html) is not working

Ah sorry, try [GHC 9.4.5 is now available — The Glasgow Haskell Compiler](https://www.haskell.org/ghc/blog/20230418-ghc-9.4.5-released.html)

The links might be broken because the documentation is automatically produced by hadrian in GHC 9.4. I will try to update the remaining links.

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**Author:** ![hasufell](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.haskell.org/hasufell/32/1250_2.png) [@hasufell](https://discourse.haskell.org/u/hasufell)\
**Post date:** [April 20, 2023, 10:15am UTC](https://discourse.haskell.org/t/ghc-9-4-5-is-now-available/6164/4 "2023-04-20T10:15:26Z")

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This is released in ghcup now. FreeBSD bindists have not been produced yet.

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**Author:** ![mpilgrem](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.haskell.org/mpilgrem/32/2529_2.png) [@mpilgrem](https://discourse.haskell.org/u/mpilgrem)\
**Post date:** [April 20, 2023, 5:14pm UTC](https://discourse.haskell.org/t/ghc-9-4-5-is-now-available/6164/5 "2023-04-20T17:14:02Z")

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I have updated Stack’s default `setup-info` dictionary for these binary distributions, and added GHC 9.4.5’s global hints to `global-hints.yaml`.

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**Author:** ![Jappie](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.haskell.org/jappie/32/5394_2.png) [@Jappie](https://discourse.haskell.org/u/Jappie)\
**Post date:** [April 20, 2023, 9:16pm UTC](https://discourse.haskell.org/t/ghc-9-4-5-is-now-available/6164/6 "2023-04-20T21:16:10Z")

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thank you! 🙂

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**Author:** ![mpilgrem](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.haskell.org/mpilgrem/32/2529_2.png) [@mpilgrem](https://discourse.haskell.org/u/mpilgrem)\
**Post date:** [May 1, 2023, 5:43pm UTC](https://discourse.haskell.org/t/ghc-9-4-5-is-now-available/6164/7 "2023-05-01T17:43:21Z")

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If you are using GHC 9.4.5 on Windows with a dependency on the `network` package, you will need to bump to the newly-released `network-3.1.2.9` to avoid a glitch.