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Merlin 5.7.1-504

We're happy to announce the release of Merlin 5.7.1-504, a patch release for the OCaml 5.4 series. This release brings:

  • A fix for a typer cache invalidation bug (#2062) where Merlin would not pick up newly created .cmi files appearing in the build path, for instance when Dune built a new module.
  • A change to the on-disk index format (#2051) so that merged indexes can point to existing index files, resulting in significantly smaller index files and fewer write operations.

For more details, see the full changelog below.

See full changelog

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)
  • index format
    • Merged indexes now point to each-others. This results in smaller index files. The index of a project is now defined by all its index files, not only the final aggregation. (#2051)