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# Release 14.12 ("Caterpillar", 2014/12/30) {#sec-release-14.12}
In addition to numerous new and upgraded packages, this release has the following highlights:
- Systemd has been updated to version 217, which has numerous [improvements.](http://lists.freedesktop.org/archives/systemd-devel/2014-October/024662.html)
- [Nix has been updated to 1.8.](https://www.mail-archive.com/nix-dev@lists.science.uu.nl/msg13957.html)
- NixOS is now based on Glibc 2.20.
- KDE has been updated to 4.14.
- The default Linux kernel has been updated to 3.14.
- If `users.mutableUsers` is enabled (the default), changes made to the declaration of a user or group will be correctly realised when running `nixos-rebuild`. For instance, removing a user specification from `configuration.nix` will cause the actual user account to be deleted. If `users.mutableUsers` is disabled, it is no longer necessary to specify UIDs or GIDs; if omitted, they are allocated dynamically.
Following new services were added since the last release:
- `atftpd`
- `bosun`
- `bspwm`
- `chronos`
- `collectd`
- `consul`
- `cpuminer-cryptonight`
- `crashplan`
- `dnscrypt-proxy`
- `docker-registry`
- `docker`
- `etcd`
- `fail2ban`
- `fcgiwrap`
- `fleet`
- `fluxbox`
- `gdm`
- `geoclue2`
- `gitlab`
- `gitolite`
- `gnome3.gnome-documents`
- `gnome3.gnome-online-miners`
- `gnome3.gvfs`
- `gnome3.seahorse`
- `hbase`
- `i2pd`
- `influxdb`
- `kubernetes`
- `liquidsoap`
- `lxc`
- `mailpile`
- `mesos`
- `mlmmj`
- `monetdb`
- `mopidy`
- `neo4j`
- `nsd`
- `openntpd`
- `opentsdb`
- `openvswitch`
- `parallels-guest`
- `peerflix`
- `phd`
- `polipo`
- `prosody`
- `radicale`
- `redmine`
- `riemann`
- `scollector`
- `seeks`
- `siproxd`
- `strongswan`
- `tcsd`
- `teamspeak3`
- `thermald`
- `torque/mrom`
- `torque/server`
- `uhub`
- `unifi`
- `znc`
- `zookeeper`
When upgrading from a previous release, please be aware of the following incompatible changes:
- The default version of Apache httpd is now 2.4. If you use the `extraConfig` option to pass literal Apache configuration text, you may need to update it --- see [Apache's documentation](http://httpd.apache.org/docs/2.4/upgrading.html) for details. If you wish to continue to use httpd 2.2, add the following line to your NixOS configuration:
```nix
{
services.httpd.package = pkgs.apacheHttpd_2_2;
}
```
- PHP 5.3 has been removed because it is no longer supported by the PHP project. A [migration guide](http://php.net/migration54) is available.
- The host side of a container virtual Ethernet pair is now called `ve-container-name` rather than `c-container-name`.
- GNOME 3.10 support has been dropped. The default GNOME version is now 3.12.
- VirtualBox has been upgraded to 4.3.20 release. Users may be required to run `rm -rf /tmp/.vbox*`. The line `imports = [ <nixpkgs/nixos/modules/programs/virtualbox.nix> ]` is no longer necessary, use `services.virtualboxHost.enable = true` instead.
Also, hardening mode is now enabled by default, which means that unless you want to use USB support, you no longer need to be a member of the `vboxusers` group.
- Chromium has been updated to 39.0.2171.65. `enablePepperPDF` is now enabled by default. `chromium*Wrapper` packages no longer exist, because upstream removed NSAPI support. `chromium-stable` has been renamed to `chromium`.
- Python packaging documentation is now part of nixpkgs manual. To override the python packages available to a custom python you now use `pkgs.pythonFull.buildEnv.override` instead of `pkgs.pythonFull.override`.
- `boot.resumeDevice = "8:6"` is no longer supported. Most users will want to leave it undefined, which takes the swap partitions automatically. There is an evaluation assertion to ensure that the string starts with a slash.
- The system-wide default timezone for NixOS installations changed from `CET` to `UTC`. To choose a different timezone for your system, configure `time.timeZone` in `configuration.nix`. A fairly complete list of possible values for that setting is available at <https://en.wikipedia.org/wiki/List_of_tz_database_time_zones>.
- GNU screen has been updated to 4.2.1, which breaks the ability to connect to sessions created by older versions of screen.
- The Intel GPU driver was updated to the 3.x prerelease version (used by most distributions) and supports DRI3 now.
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