Minecraft: Java Edition · Game update

Minecraft 1.21: Tricky Trials

Tricky Trials added trial chambers, an underground structure built around trial spawners and vaults. It also brought the breeze and bogged mobs, the mace, the crafter and the copper and tuff block families.

Released
Server needs
Java 21
Protocol
767
Start a 1.21 serverStart a free server

Seven days free, no card. Pick 1.21 when you create the server, or switch an existing one from the panel.

What is new in Minecraft 1.21

The additions people noticed first, then everything else by area.

  • Trial chambers generate underground with combat challenges
  • Trial spawners and vaults give loot
  • Breeze and bogged mobs added
  • Mace, crafted from a breeze rod and a heavy core
  • Crafter automates crafting with redstone
  • Twenty new paintings added

Blocks and items

  • Copper bulbs, grates, doors, trapdoors and chiseled copper with oxidation
  • Tuff stairs, slabs, walls, chiseled tuff and polished variants
  • Crafter, a redstone powered crafting block
  • Ominous bottles, which grant Bad Omen levels one to five
  • Potions of Wind Charging, Weaving, Oozing and Infestation
  • Mace, crafted from a breeze rod and a heavy core
  • Heavy core, dense and explosion resistant
  • Flow and Bolt armour trims
  • Twenty new paintings by Sarah Boeving and Kristoffer Zetterstrand

Mobs

  • Breeze, a wind based hostile mob from trial chambers
  • Bogged, a skeleton variant found in trial chambers

World and biomes

  • Trial chambers generate underground with many rooms of combat challenges
  • They are built from copper and tuff and hold trial spawners and vaults

Gameplay

  • Bad Omen now interacts with trial spawners instead of triggering raids
  • Ominous bottles replace Bad Omen as the way to start a raid
  • Ominous trial spawners are harder and give better rewards
  • Vaults unlock with trial keys, ominous vaults need ominous trial keys
  • Ominous vaults drop the heavy core 7.5 percent of the time
  • Crafter has a 3 by 3 grid with toggleable slots
  • Crafter ejects one crafted item per redstone pulse from its front
  • New enchantments Density, Breach and Wind Burst

Commands and technical

  • Data pack format 48
  • Resource pack format 34
  • Data version 3953

Running a Minecraft 1.21 server

What the release means for whoever runs the server.

  • Requires Java SE 21
  • Requires a 64 bit operating system
  • Protocol version 767
  • Data pack format 48, resource pack format 34
  • A modified client can crash the server with malicious command completion requests
  • That crash is fixed in 1.21.1, so run 1.21.1 rather than 1.21

Before you update a world: take a backup. A world opened in 1.21 cannot be opened in an older version again. How backups work here.

1.21 on FadeHost

The right Java, set for you
A 1.21 server needs Java 21, and the panel starts it with a Java that fits. Nothing to install, nothing to pick.
Server software for 1.21
PaperPurpurVanillaFabricForge
Who can join
Players on 1.21 and on 1.21.1: the network protocol is the same.
Start a 1.21 server

Patches after 1.21

The fix releases that followed, oldest first.

Minecraft 1.21.1

· Java 21

1.21.1 is a hotfix for Tricky Trials that closed a remote server crash and a block entity duplication exploit. It keeps protocol 767, so it is compatible with 1.21 servers.

What 1.21.1 changed

Questions about 1.21

When was Minecraft 1.21 released?

Minecraft: Java Edition 1.21, Tricky Trials, was released on June 13, 2024.

What Java version does a Minecraft 1.21 server need?

Java 21. On FadeHost the server starts with the right Java for its Minecraft version on its own, so there is nothing to install or switch.

What did Minecraft 1.21 add?

Tricky Trials added trial chambers, an underground structure built around trial spawners and vaults. It also brought the breeze and bogged mobs, the mace, the crafter and the copper and tuff block families.

Can players on another version join a 1.21 server?

Players on 1.21.1 can: the network protocol (767) is the same. Any other version has to match the server, unless a Paper server runs plugins such as ViaVersion and ViaBackwards.

Can I update my world to Minecraft 1.21?

Yes. Take a backup, switch the server to 1.21 and start it: the world is converted on the first boot. A world opened in 1.21 cannot be opened in an older version again, so keep the backup until you are sure.

How do I start a Minecraft 1.21 server?

Create a server on FadeHost and pick 1.21 in the software list: Paper, Purpur, Vanilla, Fabric and Forge are there for this version. It is online in about a minute. The free tier runs a 2 GB server at no cost, and a paid server is sized to the RAM you need.

The release before

Minecraft 1.20.6

April 29, 2024

The release after

Minecraft 1.21.1

August 8, 2024

Read on

Change a server's version

Version, software and loader build are one setting in the panel.

Java version errors

What the wrong Java looks like in the console, and why it does not happen here.

RAM calculator

How much memory a server needs, sized from servers measured on our nodes.

Every Minecraft version

All releases, what each one added and the Java it needs.

Release facts from the Minecraft Wiki:Java Edition 1.21. Minecraft is a trademark of Mojang; FadeHost is not affiliated with Mojang or Microsoft.