# Nixpkgs 25.05 (2025.05/??) {#sec-nixpkgs-release-25.05}

## Backward Incompatibilities {#sec-nixpkgs-release-25.05-incompatibilities}

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### Titanium removed {#sec-nixpkgs-release-25.05-incompatibilities-titanium-removed}

- `titaniumenv`, `titanium`, and `titanium-alloy` have been removed due to lack of maintenance in Nixpkgs.

## Nixpkgs Library {#sec-nixpkgs-release-25.05-lib}

### Breaking changes {#sec-nixpkgs-release-25.05-lib-breaking}

- Structure of the `functor` of some types has changed. `functor` is an implementation detail and should not be relied upon. If you did rely on it let us know in this [PR](https://github.com/NixOS/nixpkgs/pull/363565).
  - [`lib.types.enum`](https://nixos.org/manual/nixos/unstable/#sec-option-types-basic): Previously the `functor.payload` was the list of enum values directly. Now it is an attribute set containing the values in the `values` attribute.
  - [`lib.types.separatedString`](https://nixos.org/manual/nixos/unstable/#sec-option-types-string): Previously the `functor.payload` was the seperator directly. Now it is an attribute set containing the seperator in the `sep` attribute.