The $1 bill hasn’t been redesigned in more than 50 years
In 1996, the government began redesigning the $100 note (as well as other notes in the following years) to better protect it against counterfeiting — the first major change in 67 years, according to the Bureau of Engraving and Printing. The $1 bill, on the other hand, is so rarely counterfeited that there are no plans to redesign it.