Fabric API Release Notes

Version 0.133.14+1.21.9 (Pre-release)

Released: September 29, 2025
Minecraft Version: 1.21.9 Snapshot

What’s Changed

Registry Synchronization Improvements

We’ve enhanced how injection location registries are synchronized across the client and server. This update also adds safeguards to prevent the same registry from being tracked multiple times, which could cause subtle bugs that are difficult to diagnose.

Technical Details: PR #4887 – Thanks to modmuss50

Model Loading Plugin Enhancement

The PreparableModelLoadingPlugin.DataLoader now receives a ResourceReloader.Store parameter. This gives developers access to shared state between resource reloaders, opening up new possibilities for complex model loading scenarios.

Technical Details: PR #4890 – Thanks to modmuss50

Maintenance

  • Version bump to align with Minecraft 1.21.9

Note: This is a pre-release build for testing. Report any issues you encounter on our GitHub tracker.

Link file: fabric-api-0.133.14+1.21.9.jar

Installation Notes

For Players:

  • Download the appropriate version for your Minecraft version
  • Place the JAR file in your mods folder
  • Requires Fabric Loader 0.17.2 or newer

For Developers:

  • Use Loom 1.11 or newer for development
  • Update your fabric.mod.json to require the appropriate Fabric API version
  • Check the linked PRs for detailed API usage examples

Getting Help

Note: Pre-release versions are for testing and may contain bugs. Use stable releases for production environments.


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