Using old review book for AP Psychology

Hello!
I’m planning to start preparing for the AP Psych exam soon, but I have a question.
Currently, I have Barron’s AP Psych prep book 2011 edition, but I was wondering if I should buy a new edition or use the one I have. I heard that the psych curriculum has not changed ever since it was offered. What do you guys think?

The older book is fine. As long as the test has not changed, which in this case it has not, the newer books do not have that much different material.