A few pex releases coming tonight / tomorrow: + 1.4.9 will have a bugfix over 1.4.8: https://github.com/pantsbuild/pex/issues/583 + 1.5.0 will introduce new functionality with a semi-public API break (Pants uses the API at any rate): https://github.com/pantsbuild/pex/issues/585 And https://github.com/pantsbuild/pex/issues/584 tracks pinning down a semver policy / API for pex, which has probably been wanting.