## 26.1.0 (2026-02-18)

- Add the {mod}`tomllib <cattrs.preconf.tomllib>` preconf converter.
  See [here](https://catt.rs/en/latest/preconf.html#tomllib) for details.
  ([#716](python-attrs/cattrs#716))
- Customizing un/structuring of _attrs_ classes, dataclasses, TypedDicts and dict NamedTuples is now possible by using `Annotated[T, override()]` on fields.
  See [here](https://catt.rs/en/stable/customizing.html#using-typing-annotated-t-override) for more details.
  ([#717](python-attrs/cattrs#717))
- Fix structuring of nested generic classes with stringified annotations.
  ([#688](python-attrs/cattrs#688))
- Python 3.9 is no longer supported, as it is end-of-life. Use previous versions on this Python version.
  ([#698](python-attrs/cattrs#698))
- Apply the attrs converter to the default value before checking if it is equal to the attribute's value, when `omit_if_default` is true and an attrs converter is specified.
  ([#696](python-attrs/cattrs#696))
- Use the optional `_value_` type hint to structure and unstructure enums if present.
  ([#699](python-attrs/cattrs#699))
- Aliases (when in use) now properly generate rename metadata in generated hooks.
  ([#706](python-attrs/cattrs#706) [#710](python-attrs/cattrs#710))
- _cattrs_ now tracks performance using [codspeed](https://codspeed.io/python-attrs/cattrs).
  ([#703](python-attrs/cattrs#703))
- The {mod}`tomlkit <cattrs.preconf.tomlkit>` preconf converter now properly handles native `date` objects when structuring.
  ([#707](python-attrs/cattrs#707) [#708](python-attrs/cattrs#708))
- The {mod}`tomlkit <cattrs.preconf.tomlkit>` preconf converter now passes date objects directly to _tomlkit_ for unstructuring.
  ([#707](python-attrs/cattrs#707) [#708](python-attrs/cattrs#708))
- Enum handling has been optimized by switching to hook factories, improving performance especially for plain enums.
  ([#705](python-attrs/cattrs#705))
- Fix {func}`cattrs.strategies.include_subclasses` when used with {func}`cattrs.strategies.configure_tagged_union` and classes using diamond inheritance.
  ([#685](python-attrs/cattrs#685) [#713](python-attrs/cattrs#713))
- Fix {func}`cattrs.strategies.configure_tagged_union` when used with recursive type aliases.
  ([#678](python-attrs/cattrs#678) [#714](python-attrs/cattrs#714))