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https://steamcommunity.com/games/364390/announcements/detail/1670144304006629633

The update hasn't been released on GOG according to the changelog. The version 1.1.3 is considered as "optional" as save files from the earlier versions are incompatible but bring major improvements.
The developer's response: https://steamcommunity.com/app/364390/discussions/0/1692662484257912469/#c1694914736007761123
Hi! It should be here within the next 7-14 days.