25w34b — release journal
What 25w34b changed for data packs, measured against 25w34a, the build before it. Released 2025-08-19; development build — not a 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
| 25w34a | 25w34b | |
|---|---|---|
| Data pack format | 84.0 | 84.0 |
| Resource pack format | 66.0 | 66.0 |
| Data version | 4539 | 4540 |
Registries
No registry gained, lost or changed an entry.
The official notes
This build has no article at its own address. Its notes are part of Minecraft Snapshot 25w34b, which covers it — checked, not assumed: that article names 25w34b.
That article's technical changes are grouped under these headings — open it for the detail:
- Data Pack Version 84.0
- Block States
- Commands
- Data Components
- Block Entity Data
- Text components
- Resource Pack Version 66.0
Minecraft Wiki page for 25w34b.
In the journal
← 25w34a · All builds · 25w35a →
Sources
- misode/mcmeta — 25w34b summary — formats and registries, generated from the game’s own data.
- minecraft.net — Minecraft Snapshot 25w34b — section names only.