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3.21.1 release tracker

releasePR or issue for releasing a new dune versionPR or issue for releasing a new dune version

Status: Open.

#13557 In ocaml/dune;

· shonfeder opened on Feb 6, 2026

Dune should respect user-specified PPX order in <code>(preprocess (pps ...))</code> stanza

Status: Open.

#13551 In ocaml/dune;

· davesnx opened on Feb 5, 2026

Dune 3.21.0 unable to lock project depending on ocaml-system

package management

Status: Open.

Bug

#13545 In ocaml/dune;

· gridbugs opened on Feb 5, 2026

add variable capture to cram test

Status: Open.

#13539 In ocaml/dune;

· raphael-proust opened on Feb 4, 2026

Coq/Rocq support still uses hard-coded <code>coq/user-contrib</code>

rocq

Status: Open.

#13532 In ocaml/dune;

· rlepigre-skylabs-ai opened on Feb 3, 2026

Formatting dune files on save while the build is running

good first issueGood for contributing for the first time to the Dune codebaseGood for contributing for the first time to the Dune codebase

rpc

Status: Open.

Bug

#13525 In ocaml/dune;

· mbarbin opened on Feb 2, 2026

Support user-define variables where possible

Status: Open.

Feature

#13501 In ocaml/dune;

· giltho opened on Jan 30, 2026

Dune 3.21.0 crashes and hangs with "Dependency cycle between ..."

Status: Open.

#13500 In ocaml/dune;

· nojb opened on Jan 30, 2026

pkg: provide a way to update the lock file without advancing the opam snapshot

package management

Status: Open.

Feature

#13494 In ocaml/dune;

· v-gb opened on Jan 29, 2026

install stanza in dynamic_include is ignored

Status: Open.

Bug

#13492 In ocaml/dune;

· tbrk opened on Jan 29, 2026

Dune should write and install <code>odoc-config.sexp</code> files

odocIssues and PRs related to documentation generation with odocIssues and PRs related to documentation generation with odoc

Status: Open.

Feature

#13485 In ocaml/dune;

· Leonidas-from-XIV opened on Jan 28, 2026

pkg: dune utop and #require

Status: Open.

#13471 In ocaml/dune;

· giltho opened on Jan 27, 2026