opam OCaml Package Manager

opam is a source-based package manager for OCaml. It supports multiple simultaneous compiler installations, flexible package constraints, and a Git-friendly development workflow. Managing your OCaml installation can be as simple as:

opam list -a # List the available packages
opam install lwt # Install LWT
opam update # Update the package list
...
opam upgrade # Upgrade the installed packages to their latest version

Download and install opam » How to use opam »

News

2025年07月23日 opam 2.4.1 release

2025年07月18日 opam 2.4.0 release

2025年07月04日 opam 2.4.0 rc1 release

2025年06月18日 opam 2.4.0 beta1 release

2025年05月05日 opam 2.4.0 alpha2 release

2025年04月18日 opam 2.4.0 alpha1 release

2024年11月13日 opam 2.3.0 release

2024年10月30日 opam 2.3.0 rc1 release

2024年10月23日 opam 2.3.0 beta2 release

Contribute

Report bugs and ask for features in the opam tool
Report packaging issues or request new packages

Address general queries on the tool and packages
Discuss the tool internals
Check the state of the packages

Documentation

Installing opam

Creating Packages

The opam Manual

4591 packages

New packages
coq-lsp 0.2.4+9.1	Oct 15
html_of_jsx 0.0.6	Oct 15
ppx_import 1.12.0	Oct 15
ppxlib-tools 0.37.0	Oct 14
ppxlib 0.37.0	Oct 14
mlsolver 1.5	Oct 14
fadecider 0.7	Oct 14
climate 0.8.5	Oct 14
domain-name 0.5.0	Oct 14
pcrc 0.25.2	Oct 14
all packages