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The Polish studio had previously confirmed a spring 2020 launch window for the open-world action RPG.
“We know you are waiting for the game eagerly, and we want to deliver exactly what we promised,” Techland CEO Paweł Marchewka said in a statement posted on Twitter.
“We were initially aiming for a Spring 2020 release with Dying Light 2, but unfortunately we need more development time to fulfil our vision.
“We will have more details to share in the coming months, and will get back to you as soon as we have more information.
“We apologize for this unwelcome news,” Marchewka added. “Our priority is to deliver an experience which lives up to our own high standards and to the expectations of you, our fans.
“Please stay tuned, and thank you to our fans around the world for your continued support, patience, and understanding.”
The zombie sequel picks up 15 years after the events of the original game in a post-apocalyptic world.
Players will be able to make “impactful choices” as new protagonist Aiden Caldwell, an infected survivor “whose high-flying parkour skills and brutal combat ability make him a valuable asset in this crumbling metropolis”.
A 26-minute Dying Light 2 gameplay demo video released last year and republished below shows off an entire mission from the game.