As always, you can download the update from the canon website.
Note: if your particular operating system version (e.g., Mac OS X 10.9) doesn't show the 1.1.3 update, use an earlier OS version, this should allow you to view and download it.
Updates and fixes in the 1.1.3 firmware revision:
- Fixes a phenomenon in which the camera displays Err01 or Err60, or in rare instances will lock-up when in Live View shooting mode (or Movie shooting mode) when attached to the following STM zoom lenses: EF-S 18-55mm f/3.5-5.6 IS STM, EF-S 18-135mm f/3.5-5.6 IS STM, EF-S 55-250mm f/4-5.6 IS STM.
- Corrects some Korean language misspellings displayed on the menu screen.