The 27-year-old was a first-team regular last term, making 42 appearances in all competitions as Guingamp achieved survival in their first season back in the top flight.
Guingamp also claimed a shock Coupe de France win, stunning big-spending Monaco in the semi-final before toppling Rennes in the showpiece.
A club statement on Guingamp's official website read: "It is now official. Christophe Kerbrat (has signed) a contract extension for an additional season.
"(He is) now linked with the Red and Black until June 2018."
Kerbrat joined Guingamp from Stade Plabennecois in 2011.
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