Java Edition 1.21.9 Release Candidate 1

Minecraft 1.21.9 Release Candidate 1
1.21.9-rc1.jpg: Infobox image for Minecraft 1.21.9 Release Candidate 1 the version in Minecraft
Java Edition 1.21.9 Release Candidate 1.png: Infobox image for Minecraft 1.21.9 Release Candidate 1 the version in Minecraft
Edition

Java Edition

Release date

September 25, 2025

Type

Release Candidate

Release candidate for

1.21.9

Downloads

Client (.json)
Server

Obfuscation maps

Client
Server

Protocol version

 dec: 1073742097
 hex: 40000111

Data version

4553

Resource pack format

69.0

Data pack format

88.0

Minimum Java version

Java SE 21

1.21.9 Release Candidate 1 (known as 1.21.9-rc1 in the launcher) is the first and only release candidate for Java Edition 1.21.9, released on September 25, 2025.[1]

Fixes

2 issues fixed

From the 1.21.9 development versions

  • MC-302243 – Creakings can spawn with the spawnMonsters game rule set to false.

From the previous development version

  • MC-302278 – The texture in the middle of conduits is upside down.

Trivia

  • This version has the same protocol version number as 25w41a. The two versions are not actually compatible; 1.21.9-rc1 throws a "Network Protocol Error" message when attempting to join a 25w41a world, and 25w41a crashes when attempting to join a 1.21.9-rc1 world.

Videos

Video made by Slicedlime:

References

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