[View on GitHub](https://github.com/xenondevs/Nova/releases/tag/0.17-alpha.1)
## CREATE BACKUPS BEFORE UPDATING
Please create a backup of your server (including the worlds and Nova plugin directory) before updating to this version. Major changes were made to Nova's world file format. Please [report](https://github.com/xenondevs/Nova/issues/new/choose) any issues you encounter with the automatic legacy conversion.
## General changes
- Updated to Minecraft 1.21.1 (1.20.4 is no longer supported)
- Optimized item networks
- Parallel network ticking
- Major internal changes
- Nova now bundles all libraries instead of downloading them on startup.
### Fixes
- Fixed #304 - Break network connections during chunk save / chunk load ?
- Fixed #307 - Unbreakable block with tool
- Fixed #320 - Block#breakNaturally() and Block#remove() don't properly break solid custom Nova blocks.
## Addon API
### New Features
- New backing state config type: `LEAVES`
- Tools can now have multiple tool categories
- Item behaviors can now modify block damage
- Model generation [Nova Documentation - Creating a custom block model](https://docs.xen.cx/nova/addon/blocks/creating-blocks/#custom-model)
### Changes
- Major changes to custom items, blocks, tile-entities, and tile-entity networks.
### Migration Guide
[Nova Documentation - Migration Guide 0.16 ➝ 0.17](https://docs.xen.cx/nova/addon/migration-guide/0.16-0.17/)
Developer information
Projects on Modrinth are automatically available through a Maven repository for use with JVM build tools such as Gradle.
maven { name = "Modrinth"; url = "https://api.modrinth.com/maven" }
