# Release 16.03 ("Emu", 2016/03/31) {#sec-release-16.03}
In addition to numerous new and upgraded packages, this release has the following highlights:
- Systemd 229, bringing [numerous improvements](https://github.com/systemd/systemd/blob/v229/NEWS) over 217.
- Linux 4.4 (was 3.18).
- GCC 5.3 (was 4.9). Note that GCC 5 [changes the C++ ABI in an incompatible way](https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html); this may cause problems if you try to link objects compiled with different versions of GCC.
- Glibc 2.23 (was 2.21).
- Binutils 2.26 (was 2.23.1). See \#909
- Improved support for ensuring [bitwise reproducible builds](https://reproducible-builds.org/). For example, `stdenv` now sets the environment variable `SOURCE_DATE_EPOCH` to a deterministic value, and Nix has [gained an option](https://nixos.org/nix/manual/#ssec-relnotes-1.11) to repeat a build a number of times to test determinism. An ongoing project, the goal of exact reproducibility is to allow binaries to be verified independently (e.g., a user might only trust binaries that appear in three independent binary caches).
- Perl 5.22.
The following new services were added since the last release:
- `services/monitoring/longview.nix`
- `hardware/video/webcam/facetimehd.nix`
- `i18n/input-method/default.nix`
- `i18n/input-method/fcitx.nix`
- `i18n/input-method/ibus.nix`
- `i18n/input-method/nabi.nix`
- `i18n/input-method/uim.nix`
- `programs/fish.nix`
- `security/acme.nix`
- `security/audit.nix`
- `security/oath.nix`
- `services/hardware/irqbalance.nix`
- `services/mail/dspam.nix`
- `services/mail/opendkim.nix`
- `services/mail/postsrsd.nix`
- `services/mail/rspamd.nix`
- `services/mail/rmilter.nix`
- `services/misc/autofs.nix`
- `services/misc/bepasty.nix`
- `services/misc/calibre-server.nix`
- `services/misc/cfdyndns.nix`
- `services/misc/gammu-smsd.nix`
- `services/misc/mathics.nix`
- `services/misc/matrix-synapse.nix`
- `services/misc/octoprint.nix`
- `services/monitoring/hdaps.nix`
- `services/monitoring/heapster.nix`
- `services/monitoring/longview.nix`
- `services/network-filesystems/netatalk.nix`
- `services/network-filesystems/xtreemfs.nix`
- `services/networking/autossh.nix`
- `services/networking/dnschain.nix`
- `services/networking/gale.nix`
- `services/networking/miniupnpd.nix`
- `services/networking/namecoind.nix`
- `services/networking/ostinato.nix`
- `services/networking/pdnsd.nix`
- `services/networking/shairport-sync.nix`
- `services/networking/supplicant.nix`
- `services/search/kibana.nix`
- `services/security/haka.nix`
- `services/security/physlock.nix`
- `services/web-apps/pump.io.nix`
- `services/x11/hardware/libinput.nix`
- `services/x11/window-managers/windowlab.nix`
- `system/boot/initrd-network.nix`
- `system/boot/initrd-ssh.nix`
- `system/boot/loader/loader.nix`
- `system/boot/networkd.nix`
- `system/boot/resolved.nix`
- `virtualisation/lxd.nix`
- `virtualisation/rkt.nix`
When upgrading from a previous release, please be aware of the following incompatible changes:
- We no longer produce graphical ISO images and VirtualBox images for `i686-linux`. A minimal ISO image is still provided.
- Firefox and similar browsers are now _wrapped by default_. The package and attribute names are plain `firefox` or `midori`, etc. Backward-compatibility attributes were set up, but note that `nix-env -u` will _not_ update your current `firefox-with-plugins`; you have to uninstall it and install `firefox` instead.
- `wmiiSnap` has been replaced with `wmii_hg`, but `services.xserver.windowManager.wmii.enable` has been updated respectively so this only affects you if you have explicitly installed `wmiiSnap`.
- `jobs` NixOS option has been removed. It served as compatibility layer between Upstart jobs and SystemD services. All services have been rewritten to use `systemd.services`
- `wmiimenu` is removed, as it has been removed by the developers upstream. Use `wimenu` from the `wmii-hg` package.