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The general answer would be no, unless your tenancy agreement would allow such a change.
Additionally, in accordance with the law, any amendment to a tenancy agreement has to have your written signature and agreement.
Without such a legal procedure, the landlord can't modify the terms of the agreement.
If the agreement ends, it means that the agreement no longer produces any legal effects and you could reach a new agreement with different terms, thus, the duration of the contract can be changed and it would be lawful to do so.