v2.21.0

Features & Improvements

• Pass original working directory as env variable to pdm scripts (#3179)
• Output similar commands or script command when the input command is not correct (#3270)
• improve readability of Python interpreter validation message (#3276)
• Print task name by default when using pdm run (#3277)
• Make OrderedSet.__contains__ run in O(1) (#3280)
• Emit post_lock after writing pyproject.toml and pdm.lock in add/update (#3285)
• Drop support of Python 3.8 (#3298)

Bug Fixes

• Fix the name normalization issue for optional dependency groups. (#3271)
• Don't use uv when installing plugins in project. (#3283)
• Fix the bug that pdm plugins are invalid after installation on ubuntu system python. (#3289)

v2.20.1

Features & Improvements

• Add a fixer to remove the deprecated cross_platform strategy from lock file. (#3259)

Bug Fixes

• Fix the bug that pdm build would fail when use_uv is true. (#3231)
• Fix group name normalization when comparing groups. (#3247)
• Inherit file descriptors instead of closing when running child processes in pdm run. (#3252)
• Fix using no_proxy when all_proxy is set. (#3254)
• Preserve multiline arrays and don't add empty tool.pdm table header when updating the pyproject.toml. (#3258)
• Fix compatibility of ErrorArgumentParser for Python 3.12 and above. (#3264)

v2.20.0.post1

Features & Improvements

• Support dependency groups as standardized by PEP 735. By default, dev dependencies will be written to [dependency-groups] table. (#3230)

Bug Fixes

• Fix a bug that strategy.inherit_metadata config is not honored when using --lockfile option. (#3232)
• Always perform install-time resolution when use_uv is on. (#3233)

Miscellany

• Update resolvelib to 1.1.0. (#3235)

v2.20.0

Features & Improvements

• Support dependency groups as standardized by PEP 735. By default, dev dependencies will be written to [dependency-groups] table. (#3230)

Bug Fixes

• Fix a bug that strategy.inherit_metadata config is not honored when using --lockfile option. (#3232)
• Always perform install-time resolution when use_uv is on. (#3233)

Miscellany

• Update resolvelib to 1.1.0. (#3235)

v2.19.3

Features & Improvements

• Allow linking existing Python interpreters to PDM's managed location. (#3215)

Bug Fixes

• Fix a bug that overrides provided by environment variables do not work. (#3182)
• Allow prereleases when the requirement is pinned even if disabled by project (#3202)
• Pass the python path to the uv venv command. (#3204)
• Fix the infinite loop when running in uv mode if the current project has dynamic metadata. (#3207)
• Add --no-frozen-deps option to install-pdm.py script to allow installing newer versions of dependencies. (#3213)
• pdm self update now prefers the locked dependencies unless --no-frozen-deps is specified. (#3216)
• By default, pdm outdated will only list direct dependencies. This can be changed by adding the --include-sub option. (#3218)

Documentation

• Show users the way to uninstall pdm in a more obvious way (#2470)

v2.19.2

Features & Improvements

• Support installing free-threaded Python interpreters with the t suffix. (#3201)

Bug Fixes

• use_uv fails to lock when there are non-ascii characters in pyproject.toml on Windows. (#3181)
• Fix the pre_install and post_install signals receiving an exhausted generator, instead of a list of packages. (#3190)
• Create backup file with random filename to avoid conflicts. (#3193)
• Fix the logic error in the uv format marker matching. (#3197)
• pdm lock --check on a lockfile generated with older PDM version has a 0 exit code when there's a change in pyproject.toml. (#3199)

Documentation

• Fixed Bash Completion suggestion so it doesn't require root privileges (#3183)

v2.19.1

Bug Fixes

• PDM libraries are not loaded correctly for in-process scripts when installed in the user site. (#3178)

v2.19.0

Bug Fixes

• Fallback version to 0.0.0 when the version is not specified or empty. This can avoid crash when building such project. (#3163)
• Ensures that / is URL encoded in sources URL environment variables. (#3169)
• Call functions from shared library in the in-process env_spec.py script. (#3176)

Removals and Deprecations

• PDM no longer falls back to setuptools-pep660 when the build backend doesn't support PEP 660. (#3159)

Miscellany

• Change the project structure to a normal package from a namespace package. (#3155)

v2.18.2

Bug Fixes

• Respect the excludes and overrides settings when installing packages. (#3113)
• Fix a bug of export command that packages with extras are included twice. (#3123)
• Remove empty groups when removing packages with pdm remove. (#3133)
• When running pdm venv purge, if the current project's python version had been referencing the removed venv then clear it out. (#3137)
• Fix command pdm config to not show site configuration file path if it doesn't exist. (#3149)
• Now when --no-markers is used, the exported requirements can only work on the current platform. (#3152)

Miscellany

• Skip tests related to python installation on non-standard platforms. (#3053)

v2.19.0a0

Breaking Changes

• pre_install and post_install signals now receive the list of packages to be installed, instead of a candidate mapping. (#3144)

Features & Improvements

• Deprecate Core.synchronizer_class attribute. To get the synchronizer class, use Project.get_synchronizer method instead.
  Deprecate Core.resolver_class attribute. To get the resolver class, use Project.get_resolver method instead. (#3144)
• Add experimental support for uv as the resolver and installer. One can opt in by setting use_uv to true using pdm config command. (#3144)

Bug Fixes

• Respect the excludes and overrides settings when installing packages. (#3113)
• Fix a bug of export command that packages with extras are included twice. (#3123)
• Remove empty groups when removing packages with pdm remove. (#3133)
• When running pdm venv purge, if the current project's python version had been referencing the removed venv then clear it out. (#3137)