nixpkgs/doc/release-notes/rl-2605.section.md

Nixpkgs 26.05 ("Yarara", 2026.05/??)

Highlights

• GCC has been updated from GCC 14 to GCC 15. This introduces some backwards incompatible changes; Refer to the upstream porting guide for details.

• Node.js default version has been updated from 22 LTS to 24 LTS. This introduces some breaking changes; Refer to the upstream migration article for details.

Backward Incompatibilities

• xfce.mkXfceDerivation has been deprecated (i.e. conditioned behind nixpkgs.config.allowAliases) and will be removed in NixOS 26.11, please use stdenv.mkDerivation directly. You can migrate by adding pkg-config, xfce4-dev-tools, and wrapGAppsHook3 to your nativeBuildInputs and --enable-maintainer-mode to your configureFlags.

• corepack_latest has been removed, as Corepack is no longer distributed with Node.js.

• spoof has been removed, as there are many issues upstream with it working on modern OS versions, and it appears to be unmaintained.

• kanata now requires karabiner-dk version 6.0+ or later. The package has been updated to use the new karabiner-dk package and the darwinDriver output stays at the version defined in the package.

• elegant-sddm has been updated to be Qt6 compatible. Themes for SDDM are slightly different so read the wiki for more.

• iroh has been removed and split up into iroh-dns-server and iroh-relay.

• python3Packages.gradio has been updated to version 6. See upstream's migration guide at https://www.gradio.app/main/guides/gradio-6-migration-guide.

• vicinae has been updated to v0.17. Version 0.17 contains a complete overhaul of the configuration system. For update instructions, see the release notes for v0.17.0 and the upstream configuration documentation.

• All Log4Shell vulnerability scanners were removed, as they were all unmaintained upstream and are no longer relevant given that the vulnerability has been fixed upstream for several years.

• Plugins for the JetBrains IDEs have been removed from Nixpkgs.

• jetbrains.plugins.addPlugins no longer supports plugin names or ID strings. You can still use addPlugins with plugin derivations, such as plugins packaged outside of Nixpkgs.

• asio (standalone version of boost::asio) has been updated from 1.24.0 to 1.36.0. Some breaking changes were introduced between these two versions, and the one affected most was the removal of asio::io_service in favor of asio::io_context in 1.33.0. asio_1_32_0 is retained for packages that have not completed migration. asio_1_10 has been removed as no packages depend on it anymore. asio also no longer propagates boost as it is used independent from boost in most cases.

• Ethercalc and its associated module have been removed, as the package is unmaintained and cannot be installed from source with npm now.

• nodePackages.prebuild-install was removed because it appeared to be unmaintained upstream. See upstream's recommendations for alternatives.

• davis made changes to the IMAP_AUTH_URL option. The flags are now standalone parameters that you need to fill:

  • Before:

    IMAP_AUTH_URL={imap.gmail.com:993/imap/ssl/novalidate-cert}
    

  • After:

    IMAP_AUTH_URL=imap.mydomain.com:993
    IMAP_ENCRYPTION_METHOD=ssl
    IMAP_CERTIFICATE_VALIDATION=false
    

• python3packages.pillow-avif-plugin has been removed as the functionality is included in python3packages.pillow directly since version 11.3.

• services.openssh.settings.AcceptEnv now explicitly defined as an option that takes a list of strings, to facilitate option merging. Setting it to a string value is no longer supported.

• All Xfce packages have been moved to top level (e.g. if you previously added pkgs.xfce.xfce4-whiskermenu-plugin to environment.systemPackages, you will need to change it to pkgs.xfce4-whiskermenu-plugin). The xfce scope will be removed in NixOS 26.11.

• vimPlugins.nvim-treesitter has been updated to main branch, which is a full and incompatible rewrite. If you can't or don't want to update, you should use vimPlugins.nvim-treesitter-legacy.

Other Notable Changes

• uptime-kuma has been updated to v2, which requires an automated migration that can take a few hours. A backup is highly recommended. If your SQLite database is corrupted, the migration might fail and require manual intervention. See the migration guide for more information.

• The services.nextcloud-spreed-signaling NixOS module has been added to facilitate declarative management of a standalone Spreed signaling server ("High Performance Backend" for Nextcloud Talk).

• fetchPnpmDeps and pnpmConfigHook were added as top-level attributes, replacing the now deprecated pnpm.fetchDeps and pnpm.configHook attributes.

• Added dell-bios-fan-control package and service.

• We now use the upstream wrapper script for Gradle, supporting both the JAVA_HOME and GRADLE_OPTS environment variables.

Nixpkgs Library

Breaking changes

• The nodejs_latest alias now points to nodejs_25 instead of nodejs_24.

• mold is now wrapped by default.

Deprecations

• mpv-unwrapped.scripts and mpv-unwrapped.wrapper have been removed. Please use mpvScripts and mpv.override accordingly.

Additions and Improvements

• The builder php.buildComposerProject2 for PHP applications has been improved for better reliability and stability.