congratulate (someone) (up)on (something)
To praise someone for an accomplishment or other positive development. I just have to congratulate you on winning the tournament—you totally deserve it. Have you congratulated Fran on her new house yet?
congratulate someone (up)on something
to compliment or wish happiness to someone because of something. (Upon is formal and less commonly used than on.) I want to congratulate you on your recent success. I congratulate you on your new job!