Minecraft 25w19a Update - What's New
A small snapshot late in the Chase the Skies cycle. Projectiles got a hit margin that grows during their flight, fog was tuned for more depth and gets thicker in rain, and the happy ghast scale got a limit.
Overview
Minecraft 25w19a is a weekly development snapshot for Minecraft: Java Edition, published on May 6, 2025. Snapshots are Mojang's weekly previews of in-progress features (development week 19 of 2025), shipped early so the community can test and report problems before anything is finalized. This one logs 7 changes you can try in a throwaway test world.
The work in this update spans changes and technical. On the changes side it brings Projectiles start with no hit margin for two ticks, then grow to the old 0.3 blocks and Fog was tweaked for more atmospheric depth, and it gets foggier when it rains.
This build is part of the development cycle leading to 1.21.6 (the Chase the Skies drop). Treat it as a preview rather than a destination: features can change, be renamed, or be cut entirely before they reach the stable release, so it is meant for testing and feedback, not for your main world or a live server.
Changes
#Changes(3)
- Projectiles start with no hit margin for two ticks, then grow to the old 0.3 blocks
- Fog was tweaked for more atmospheric depth, and it gets foggier when it rains
- Game tests no longer restart by themselves after a server restart
#Technical(4)
- Data pack version 76
- The scale attribute of the happy ghast is capped at 1.0
- TNT and vexes store who primed or owns them
- Launching with quickPlaySingleplayer and no world opens the last played world
Server Admin Migration Guide
- Snapshot only, not for a live server: keep production on the current release
- Combat and archery plugins may notice the new projectile hit margin
Known Issues
- Development snapshot, features can still change before 1.21.6
What This Means
For players
Snapshots are opt-in through the official launcher. Always make a copy of any world before opening it in 25w19a, because development builds can corrupt saves and there is no guarantee the world will open in a later version. Use a fresh test world to try the new content safely.
For server admins
Do not run 25w19a on a public server. Snapshots are unsupported by server software and most plugins. Spin up a private staging instance, confirm your plugins load, and report regressions while there is still time to fix them before release.
Background & Context
- Snapshots ship roughly once a week during active development and are enabled through the "Latest snapshot" toggle in the official launcher.
- The content here was being developed toward 1.21.6 (the Chase the Skies drop); individual features may have been adjusted, renamed, or removed before that version shipped.
- Always keep a backup of important worlds before changing versions; the Astroworld versions database tracks client and server compatibility for 25w19a.
Frequently Asked Questions
When was Minecraft 25w19a released?
Minecraft 25w19a was released on May 6, 2025 as a weekly development snapshot for Minecraft: Java Edition.
What is new in 25w19a?
A small snapshot late in the Chase the Skies cycle. Projectiles got a hit margin that grows during their flight, fog was tuned for more depth and gets thicker in rain, and the happy ghast scale got a limit. Notable entries include: Projectiles start with no hit margin for two ticks, then grow to the old 0.3 blocks; Fog was tweaked for more atmospheric depth, and it gets foggier when it rains; Game tests no longer restart by themselves after a server restart. In total it documents 7 changes across 2 categories.
Should I use 25w19a on my main world?
No. 25w19a is a weekly development snapshot meant for testing. Keep your main world on the latest stable release and only open a backup copy in a separate test world to try the new content.
Can I run 25w19a on a Minecraft server?
It is not recommended for a public server. Snapshot only, not for a live server: keep production on the current release. Use a private staging instance to test plugins and mods, not to host players.
Which Minecraft version is 25w19a a preview of?
25w19a is part of the development cycle for 1.21.6 (the Chase the Skies drop). Features shown here are still in progress and may change before the final release.
Are there known issues in 25w19a?
Yes. Documented issues for this build include: Development snapshot, features can still change before 1.21.6. Development builds are expected to have rough edges that get fixed before release.
Looking for version compatibility info?
Check client and server version details on our versions database.