The 23-year-old signed a three-year extension in April, 2024.
The club has rewarded the 2024 Dolphins player of the year's outstanding form - which also included winning the players' player and best forward award - with an extra season.
With Papua New Guinea's franchise entering the competition in 2028 and a possible Western Bears outfit slated for 2027 it means that Plath, a natural target for his quality and versatility, will be out of their early clutches.
The son of Brisbane four-time premiership winner John Plath has proven to be a revelation and one of the most adaptable players in the NRL.
Last year he was equally as effective at lock and hooker. He set up a try while playing second-row in the 26-18 trial loss to Gold Coast on Saturday and can also handle himself with aplomb in the halves.
Plath's deal is effectively a new four-year upgraded contract.
"Max is so versatile. He is one of those guys you can throw in at almost any position and he will give you a performance," Dolphins CEO Terry Reader said."He had an amazing first full season in the NRL to win our 2024 player of the year award, and this contract underlines how important Max is to the Dolphins' future."
Plath first joined the Dolphins from QRL side Wynnum-Manly in 2023 and established himself as a hard-nosed competitor who regularly topped the club charts in fitness tests.
That mentality has transferred onto the field.
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