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Derail ValleyNewsUnity Security Patch
Game update

Unity Security Patch

Derail Valley · published 4 Oct 2025, 11:00 UTC

All newsPlayers around this dateRead on Steam

Hey everyone!

About This Patch

We have a small and quick update today. Two days ago, Unity, the game engine that Derail Valley is based on, announced a newly discovered security vulnerability and a patch for it (more info here).

We included the patch in Derail Valley today, for increased safety. No confirmed exploits have been observed so far in any Unity-based games, so no one should be affected - this is just precautionary.

That said, we advise you all to update the game as soon as possible, now that the vulnerability is publicly known. This update doesn't include any changes to the game itself, only the engine.

About Build 100

While we're here, it is a good opportunity to give you a quick update on B100, the next major update:

The work is deep in progress, now with concretely defined goals of what we aim the end result to be. Most of the team is currently undergoing low level infrastructural changes necessary to future-proof the game, before we can even start the actual development on the new features. This will take months.

As announced earlier, B100 will take a long time both to announce and to release, and we may be a bit quiet in the meantime while that's ongoing - potentially with some info here and there, like this. Thank you for your patience and if you've missed previous mentions of the update, please read about it here:

Have fun in the meantime and thank you!

-Your DV Team

More from Derail Valley

Other announcements

All news
Community20 Jul 2026B100 Progress Update 1Hi everyone! We have a couple of items to discuss today: reporting on the progress of our next major update; taking part in Train Fest 2026; celebrating 10 years of Derail Valley development and; announcing a major update to our soundtrack. Let's dive right into all these: Steam is launching a new event today - Train Fest 2026! Being strictly focused on trains, it could put Derail Valley in fro…Game update2 Aug 2025B99.7 - More Small Bug FixesHello everyone! We've released another set of minor fixes today. Thank you for your bug reports! You can see the changes listed here: B99.7 Changelog In the meantime we're hard at work on the next major update, B100. It’s going to take a long time, but it’ll be absolutely worth it! For more information, please see: Thank you! -Your DV TeamGame update18 Jul 2025B99.6 - Bug Fixes, Ladder-climbing & MoreHi everyone! As promised, we’re delivering more bug fixes in today's release - addressing many of the remaining less critical issues. Thank you for your bug reporting! To spice it up a little, we've also added a new ladder-climbing feature, now allowing you to seamlessly walk onto locomotives to climb up, without jumping. You can also climb ladder-equipped cars and buildings, adding to the imme…