The Finnish midfielder has been with the Glasgow club since 2019, when he signed from Dundee for £50,000.
"I have absolutely loved my time here and being a part of the title-winning team last season has given me the hunger to try to win even more in the seasons ahead.
"It was an easy decision for me to sign and I want to thank the manager, Ross Wilson and the board for the faith they have shown in me."
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