Canon EOS 5D Mark III firmware 1.2.3

It appears Canon released firmware version 1.2.3 for the 5D Mark III on 2013-10-30.

According to the Canon CHANGELOG:

Firmware Version 1.2.3 incorporates the following improvements and fixes.

1. Fixes a phenomenon in which the flash may not fire depending on the timing of when the shutter button is pressed.
2. Fixes a phenomenon in which the AF microadjustment value may change.*
3. Fixes a phenomenon in which the LCD monitor may show a line of false color along boundaries of high contrast.
4. Fixes a phenomenon in which the histogram of a LiveView image is incorrectly displayed when an HDMI cable is connected.
5. Enables the brightness of the camera’s LCD monitor to be adjusted even when an HDMI cable is connected.

*The phenomenon listed in 2 was addressed with Firmware Version 1.2.1, and has been further improved with Firmware Version 1.2.3.

Download directly from Canon at Canon USA.