# GHC 8.10.1 available

**URL:** <https://discourse.haskell.org/t/ghc-8-10-1-available/1152>\
**Category:** Announcements\
**Created:** [March 24, 2020, 3:06pm UTC](https://discourse.haskell.org/t/ghc-8-10-1-available/1152 "2020-03-24T15:06:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![bgamari](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.haskell.org/bgamari/32/3599_2.png) [@bgamari](https://discourse.haskell.org/u/bgamari)\
**Post date:** [March 24, 2020, 3:06pm UTC](https://discourse.haskell.org/t/ghc-8-10-1-available/1152/1 "2020-03-24T15:06:30Z")

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The GHC team is happy to announce the availability of GHC 8.10.1. Source and binary distributions are available at the [usual place](https://downloads.haskell.org/ghc/8.10.1/).

GHC 8.10.1 brings a number of new features including:

- The new `UnliftedNewtypes` extension allowing newtypes around unlifted types.
- The new `StandaloneKindSignatures` extension allows users to give top-level kind signatures to type, type family, and class declarations.
- A new warning, `-Wderiving-defaults` , to draw attention to ambiguous deriving clauses
- A number of improvements in code generation, including a new loop analyzer, optimisation of `memset`, `memcpy` and array allocation, more aggressive specialisation, and pointer tagging for larger data types.
- A new GHCi command, `:instances` , for listing the class instances available for a type.
- An upgraded Windows toolchain lifting the `MAX_PATH` limitation
- A new, low-latency garbage collector.
- Improved support profiling, including support for sending profiler samples to the eventlog, allowing correlation between the profile and other program events

A full accounting of the changes of this release can be found in the [release notes](https://downloads.haskell.org/ghc/8.10.1/docs/html/users_guide/8.10.1-notes.html). A guide for migrating existing code to GHC 8.10 can be found in the [release migration notes](https://gitlab.haskell.org/ghc/ghc/-/wikis/migration/8.10).

Note that at the moment we still require that macOS Catalina users exempt the binary distribution from the notarization requirement by running `xattr -cr .` on the unpacked tree before running `make install` . This situation will hopefully be improved for GHC 8.10.2 with the resolution of #17418.

Cheers,

- Ben