1.21.9 — release journal
What 1.21.9 changed for data packs, measured against 1.21.9-rc1, the build before it. Released 2025-09-30; full release.
💡 No measured change
Same data pack format, same registries. That is the strongest safe-for-data-packs signal a diff can give, and it is still not proof — behaviour changes and bug fixes are invisible to it.
Formats
| 1.21.9-rc1 | 1.21.9 | |
|---|---|---|
| Data pack format | 88.0 | 88.0 |
| Resource pack format | 69.0 | 69.0 |
| Data version | 4553 | 4554 |
Registries
No registry gained, lost or changed an entry.
The official notes
Read the 1.21.9 article on minecraft.net.
That article's technical changes are grouped under these headings — open it for the detail:
- Pack Formats
- Debug Features
- Data Pack Versions 82.0 Through 88.0
- Mannequins
- World Border
- Text Rendering
- Commands
- Data Components
- Entity Data
- Block Entity Data
- Loot Tables
- Loot Functions
- Predicates
- Enchantments
- World Generation
- Tags
- Particles
- Resource Pack Versions 64.0 Through 69.0
- Block Sprites
- Entity Sprites
- Item Sprites
- Textures
- Sounds
- Particles
- Shaders & Post-process Effects
Minecraft Wiki page for 1.21.9.
In the journal
← 1.21.9-rc1 · All builds · 1.21.10-rc1 →
Sources
- misode/mcmeta — 1.21.9 summary — formats and registries, generated from the game’s own data.
- minecraft.net — 1.21.9 — section names only.