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Minecraft 1.21.9-rc1

The build Mojang intends to ship unless a blocking bug turns up. Full source data for this version is extracted and browsable below.

2,807 names shipped in this version. Each result opens the wiki page for that thing.

Contents (5)
  1. What changed in 1.21.9-rc1
  2. Fixes
  3. Development cycle
  4. Browse this version
  5. Neighbouring versions

Java What changed in 1.21.9-rc1

Everything below is measured by comparing the game files of 1.21.9-pre4 with 1.21.9-rc1 — not copied from patch notes.

Fixes 2

Read from Mojang’s own release notes for Minecraft 1.21.9 Release Candidate 1, published 2025-09-25. Every entry keeps its original bug ID.

2 issues fixed, read from Mojang’s own patch notes. Each entry keeps its original bug ID.

Fixed bugs in 1.21.9 Release Candidate 1 2

  • MC-302243 Creakings can spawn with the "spawnMonsters" game rule set to false
  • MC-302278 The texture in the middle of conduits is upside down

Development cycle

This build was part of the run-up to 1.21.9. Everything tested here landed in that release.

Minecraft 1.21.9The release this one led to

Browse this version

BlocksEvery blockItemsEvery itemRecipesEvery recipeTagsEvery tag

Neighbouring versions

← 1.21.9-pre4 (previous)1.21.9 (next) →