# Cities: Skylines Patch Notes for 1.21.1-f9

- Product: Cities: Skylines (https://whatsnew.fyi/product/cities-skylines)
- Vendor: Colossal Order
- Date: 2026-04-15
- Original notes: https://store.steampowered.com/news/app/255710/view/540009684293128918
- Permalink: https://whatsnew.fyi/product/cities-skylines/releases/2026-04-15-patch-notes-for-1.21.1-f9

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **fixed** — Trees placed on roads no longer revert to default trees when reloading the save file
- **fixed** — Trolleybuses are no longer invisible

We have a very small update for you all today that covers the bugs reported to us over the past week. We think that this will be the last one!

_This update is very minor and should not affect mods and asset functionality._

- Fixed a bug where trees placed on roads would go back to default trees when reloading the save file.

- Fixed a bug where trolleybuses became invisible.