[ANN] new releases: Merlin 5.8 and OCaml-LSP 1.27.0 with support for OCaml 5.5

vds · June 25, 2026, 3:03pm

I am glad to announce new releases of Merlin and OCaml-LSP !

Merlin is an editor service that provides modern IDE features for OCaml and OCaml-LSP is a frontend for Merlin that speaks with LSP clients.

There are a few bug fixes in these but the main feature is the stable support for OCaml 5.5.

Full changelogs:

github.com/ocaml/merlin

CHANGES.md

main

merlin 5.8
==========
Tue Jun 23 12:15:42 CEST 2026

  + merlin library
    - Support for OCaml 5.5 (#2077, fixes #2024)
    - Fix signature-help with type aliases (#2067, fixes #1927)
    - Fix locate on punned let bindings, to use the common identifier as the
      expression (instead of the pattern) (#2066)
  + test suite
    - Remove the FIXME line for #1404 as the issue was already fixed and add two tests (#2073).

merlin 5.7.1
============
Thu Apr 30 14:15:42 CEST 2026

  + merlin library
    - Fix a cache invalidation issue due to the introduction of hidden deps in
      OCaml 5.2. (#2062)
    - Refactor the `Misc` module from `merlin_utils` to `ocaml_utils` to reduce diff with the compiler (#2059)

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github.com/ocaml/ocaml-lsp

CHANGES.md

master

# 1.27.0

## Features

- Upgrade to OCaml 5.5 (#1609)

## Fixes

- Fix compatibility with upcoming Dune versions by avoiding the `Stdune.Pid`
  module. (#1608)

# 1.26.0

## Features

- Add custom [`ocamllsp/refactorExtract`](https://github.com/ocaml/ocaml-lsp/blob/ocaml-lsp-server/docs/ocamllsp/refactorExtract-spec.md) request (#1545)
- Add `destruct` custom request (#1583)
- Add `locate_types` custom request (#1584)
- Add support for the `textDocument/rangeFormatting` request (#1591)
- Allow to configure merlin using build systems other than dune.

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[ANN] new releases: Merlin 5.8 and OCaml-LSP 1.27.0 with support for OCaml 5.5

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