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+---
+title: OCaml 5.1.0 - Second Release Candidate
+description: Second Release Candidate of OCaml 5.1.0
+date: "2023-08-29"
+tags: [ocaml, release]
+changelog: |
+  ## Last Minute Bug Fixes
+
+   ### Type System:
+ 
+  * (*breaking change*) [#6941](https://github.com/ocaml/ocaml/issues/6941), [#11187](https://github.com/ocaml/ocaml/issues/11187), +[#12483](https://github.com/ocaml/ocaml/issues/12483): prohibit using classes through recursive modules
+   inheriting or including a class belonging to a mutually-recursive module
+   would previous behave incorrectly, and now results in a clean error.
+   (Leo White, review by Gabriel Scherer and Florian Angeletti)
+
+  ### Runtime
+
+  - [#12481](https://github.com/ocaml/ocaml/issues/12481), [#12505](https://github.com/ocaml/ocaml/issues/12505): Fix incorrect initialization of array expressions
+  `[|e1;...;eN|]` when `N` is large enough to require major heap allocation.
+  (Xavier Leroy, report by Andrey Popp, analysis by KC Sivaramakrishnan
+   and Vincent Laviron, review by Gabriel Scherer)
+
+---
+In the last two weeks, two significant bugs have been discovered in the release candidate for OCaml 5.1.0 (one affecting the type system, another in the runtime).
+
+Those bugs are now fixed and we are publishing a second release candidate to check that everything is in order before the release in the upcoming week.
+
+If you find any bugs, please report them on [OCaml's issue tracker](https://github.com/ocaml/ocaml/issues).
+
+The full changelog for OCaml 5.1.0 is available [on GitHub](https://github.com/ocaml/ocaml/blob/5.1/Changes).
+A short summary of the two fixed bugs in this release candidate is also available below.
+
+---
+## Installation Instructions
+
+The base compiler can be installed as an opam switch with the following commands on opam 2.1 and later:
+```bash
+opam update
+opam switch create 5.1.0~rc2
+```
+
+The source code for the release candidate is also directly available on:
+
+* [GitHub](https://github.com/ocaml/ocaml/archive/5.1.0-rc2.tar.gz)
+* [OCaml archives at Inria](https://caml.inria.fr/pub/distrib/ocaml-5.1/ocaml-5.1.0~rc2.tar.gz)
+
+### Fine-Tuned Compiler Configuration
+
+If you want to tweak the configuration of the compiler, you can switch to the option variant with:
+```bash
+opam update
+opam switch create <switch_name> ocaml-variants.5.1.0~rc2+options <option_list>
+```
+where `<option_list>` is a comma-separated list of `ocaml-option-*` packages. For instance, for a `flambda` and `no-flat-float-array` switch:
+```bash
+opam switch create 5.1.0~rc2+flambda+nffa ocaml-variants.5.1.0~rc2+options ocaml-option-flambda ocaml-option-no-flat-float-array
+```
+
+All available options can be listed with `opam search ocaml-option`.