This is the twenty-ninth edition of our Haskell ecosystem activities report, which describes the work Well-Typed are doing on GHC, Cabal, HLS and other parts of the core Haskell toolchain. The current edition covers roughly the months of September 2025 to November 2025.

You can find the previous editions collected under the haskell-ecosystem-report tag.

Sponsorship

We offer Haskell Ecosystem Support Packages to provide commercial users with support from Well-Typed’s experts while investing in the Haskell community and its technical ecosystem including through the work described in this report. To find out more, read our announcement of these packages in partnership with the Haskell Foundation. We need funding to continue this essential maintenance work!

Many thanks to our Haskell Ecosystem Supporters: Standard Chartered, Channable and QBayLogic, as well as to our other clients who also contribute to making this work possible: Anduril, Juspay and Mercury; and to the HLS Open Collective for supporting HLS release management.

Team

Ben, who has been a key maintainer of GHC for many years, announced in October that he is moving to a new role that will allow less time for GHC work, though he remains a Partner at Well-Typed. We were delighted to welcome Magnus to the team in November.

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