The former Ivory Coast Under-20 and Under-23 international initially arrived on a short-term deal in November 2015, before extending his deal until end of the 2015/16 season.
Zoko opened his account for the Glovers with two goals against Barnet a year ago yesterday.
The 33-year-old was on target a further six times for Town, helping the club finish 14 points clear of relegation.
In his last eight matches, Zoko has scored five goals.
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