When do you switch up exercises on 5x5?

[2horns]

Im still adding weight to every one of my exercises each week, (have been doing 5x5 for about month and a half) but i was wondering when do you guys switch things up and do "new" exercises for 5x5 and 2x8-10 exercises?

 

[dude]

I would switch up when I stop increasing my poundages for the current exercises.