The 29-year old Polish goalkeeper has penned a one-year extension on his initial deal which will now keep him at Tannadice Park until the summer of 2015.
"I enjoy playing for Dundee United very much," said Cierzniak. "Having settled in the area, it is an easy decision for me to sign on for a further year.
"I came here to improve as a player and I feel I am doing so. The cub, players and supporters have all helped with this and I look forward to exciting times over the next few years at Dundee United."