Fixed

• Default core metadata version kept at 2.4 until more tools support 2.5

Changed:

• The hatch fmt command is now deprecated in favor of the new hatch check command group
• Migrate HTTP client from httpx to httpx2

Added:

• Add hatch check command group with subcommands for check code (linting), check fmt (formatting), and check types (type checking)
• Add hatch check types command for type checking using Pyrefly, with --summarize and --cover flags
• Add hatch env lock command to generate PEP 751 compliant lockfiles (pylock.toml) for environments
• Add hatch dep lock and hatch lock commands as shortcuts for locking the active environment
• Add hatch dep sync command for syncing dependencies from a lockfile
• Add pluggable dependency locker interface with built-in UV and pip implementations
• Add --cover-xml and --cover-xml-output flags to the hatch test command for generating XML coverage reports
• Add linehaul telemetry data to User-Agent header for PyPI download statistics
• Auto-create environment when locking if it doesn't exist

Fixed:

• Fix help output formatting for the run command

Fixed:

• Handle a breaking change in virtualenv by only supporting the latest version and adding python-discovery as a dependency.

Fixed:

• Source Date Epoch no longer fails when set to date before 1980.

Fixed:

• Fixes hatch shell type error for keep_env.
• SBOM documentation for including SBOM files in sdist
• Fixes workspace member detection to properly handle shared path prefixes.

Added:

• Env var for keep-env when an exception occurs during environment creation to enable debugging.

Fixed:

• Fix issue with self-referential dependencies not being recognized.
• Fix incomplete environments created when an exception occurs during creation.
• Fix dependency-groups not working with when environment is not marked as builder.
• Change Keyring to take expect repository URL instead of repository name.

Fixed:

• Properly send informational output to stderr instead of stdout
• Implement documented support for sbom-files as build data for the wheel build target
• Fix regression where environments no longer acknowledged the project.optional-dependencies field

Changed:

• Drop support for Python 3.9

Added:

• Add sbom-files option and sbom_files build data to the wheel build target for including Software Bill of Materials files.

Fixed:

• Handle special characters correctly in path for editable installs.
• Fix multiple calls to install on sync_dependencies to become a single call.
• Fix context variable formatting in project dependencies to prevent crashes when using variables like {root:parent:uri} in the [project] section.
• Fix environment overrides for dependency-groups field to properly support matrix and conditional configurations.

Changed:

• Drop support for 3.9
• Environment type plugins are now no longer expected to support a pseudo-build environment as any environment now may be used for building. The following methods have been removed: build_environment, build_environment_exists, run_builder, construct_build_command

Added:

• Support for workspaces inspired by Cargo Workspaces
• Dependency group support.
• The version and project metadata commands now support projects that do not use Hatchling as the build backend
• The version command accepts a --force option, allowing for downgrades when an explicit version number is given.
• Build environments can now be configured, the default build environment is hatch-build
• The environment interface now has the following methods and properties in order to better support builds on remote machines: project_root, sep, pathsep, fs_context
• Bump the minimum supported version of packaging to 24.2
• Upgrade Ruff to 0.13.2

Fixed:

• All HTTP requests now set an identifiable User-Agent header.
• Fix issue where terminal output would be out of sync during build.
• Fix for Click Sentinel value when using run command