The largest theater chains including AMC Entertainment, Regal Cinemas and Cinemark will invest more than $2.2 billion over the next three years to upgrade theaters in the U.S. and Canada, an industry group announced on Thursday.

The eight biggest theater chains in the U.S. and Canada announced Thursday that they plan to invest more than $2.2 billion to modernize and upgrade more than 21,000 screens over the next three years.