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Release Java Edition Hotfix Patch of 1.21 Tricky Trials

Minecraft 1.21.1

Released on 8 August 2024, Minecraft Java Edition 1.21.1 is a hotfix for 1.21 Tricky Trials. It closes critical exploits that could be used to crash servers and adds language support for Tzotzil and Belarusian (Latin).

Released 08 Aug 2024 Resource pack format 34 Data version 3955
Are my mods ready?

Key takeaways

  • Security fix: closes critical exploits that could crash servers; Mojang strongly recommends that server owners update.
  • Compatibility: players on 1.21 can still join servers running 1.21.1.
  • New languages: Tzotzil and Belarusian (Latin).

What changed

FixesFixed critical exploits that could be used to crash servers.
LanguagesAdded language support for Tzotzil and Belarusian (Latin).
ServersThe network protocol (767) is the same as in 1.21, so 1.21 clients can connect to 1.21.1 servers.
TechnicalData pack format 48 and resource pack format 34 are unchanged from 1.21.

Source: official Java Edition 1.21.1 changelog

Mods & loaders for 1.21.1

Mods must be rebuilt for each version. Counts from the files published on Modrinth and CurseForge, in our catalog.

LoaderMods with a 1.21.1 fileLatest build
Fabric2580.20.1
NeoForge30721.1.265
Forge12252.1.20
Quilt87·
Shader loadersShaders with a 1.21.1 fileLatest build
Iris113·
OptiFine78·
Popular mods Sodium · AvailableJust Enough Items (JEI) · AvailableFabric API · AvailableLithium · AvailableIris Shaders · AvailableOptiFine · Available
356 mods in our catalog have a 1.21.1 file → 302 texture packs and 69 maps in our catalog support 1.21.1. →

How to play 1.21.1

  1. 01

    Open the Minecraft Launcher and select Minecraft: Java Edition.

  2. 02

    Go to Installations, create a new installation and choose version 1.21.1.

  3. 03

    Back up your worlds before opening them in a new version.

Seeds for Minecraft 1.21.1

Worlds checked on 1.21.1: spawn biome, structures nearby and their coordinates.

Meadow biome in Minecraft, illustration
Illustration: the Meadow biome in another world (seed 2026).
Ancient City · Spawn: Meadow Ancient City right under a Meadow spawn
  • Ancient Cityat spawn
  • Trial Chambers187 blocks
  • Village (Plains)273 blocks
JAVA 26.2 ✓26.3 ✓
Plains biome in Minecraft, illustration
Illustration: the Plains biome in another world (seed 2026).
Trial Chambers · Spawn: Plains Trial Chambers right under a Plains spawn
  • Trial Chambersat spawn
  • Village (Plains)198 blocks
  • Ruined Portal253 blocks
JAVA 26.2 ✓26.3 ✓
All 65 seeds that work in 1.21.1 →

From first snapshot to release

0 snapshots, 0 pre-releases and 1 release candidates over 1 days.

  1. 1.21.1-rc107 Aug 2024
  2. 1.21.108 Aug 2024
All 1 test builds →

Minecraft 1.21.1 FAQ

When was Minecraft 1.21.1 released?

On 8 August 2024, for Java Edition. It is the hotfix for 1.21 Tricky Trials, released on 13 June 2024.

Should I update to 1.21.1?

Yes, especially if you run a server: the update closes exploits that could crash servers, and Mojang strongly recommends that server owners upgrade. It adds no new blocks, items or mobs.

Can 1.21 players join a 1.21.1 server?

Yes. Both versions use the same network protocol, so players still on 1.21 can join servers running 1.21.1.

Do 1.21 data packs and resource packs work in 1.21.1?

Yes: the formats stay at 48 for data packs and 34 for resource packs. Java 21 is still required.