Minecraft: Java Edition · Game update

Minecraft 1.21.9: The Copper Age

The Copper Age built copper out into a full tool, armor and decoration set and added the copper golem, which sorts items between chests. It also gave the End skylight, added shelves, and introduced a JSON-RPC management API for dedicated servers.

Released
Server needs
Java 21
Protocol
773
Start a 1.21.9 serverStart a free server

Seven days free, no card. Pick 1.21.9 when you create the server, or switch an existing one from the panel.

What is new in Minecraft 1.21.9

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

  • Copper tools, copper armor and a copper block family added
  • Copper golem spawns from a pumpkin on a copper block
  • Shelves store up to three stacks and respond to redstone
  • Mannequins added as customizable player-like entities
  • The End now receives skylight with periodic purple flashes
  • Server management API over JSON-RPC for dedicated servers

Blocks and items

  • Copper tools and copper armor added
  • Copper chests, lanterns, torches, bars and chains added
  • Copper blocks oxidize over time and can be waxed
  • Wooden shelves hold up to three item stacks
  • Shelves connect to redstone for bulk inventory swapping

Mobs

  • Copper golems spawn from a pumpkin placed on a copper block
  • Copper golems have 12 health and oxidize over time
  • They sort items between copper and wooden chests
  • A fully oxidized copper golem turns into a statue
  • Mannequins added as player-like entities set up by commands

World and biomes

  • The End dimension now receives skylight
  • Purple flashes occur in the End about every 30 seconds

Gameplay

  • Chat drafts survive the chat closing unexpectedly

Commands and technical

  • New /fetchprofile command retrieves player profile data
  • Five new game rules cover portals, command blocks and PvP
  • Further game rules cover monster spawning and spawners
  • Server management API added over JSON-RPC on WebSocket

Running a Minecraft 1.21.9 server

What the release means for whoever runs the server.

  • Requires Java SE 21
  • Network protocol 773
  • Data pack format 88.0
  • Resource pack format 69.0
  • Dedicated servers gain a JSON-RPC management API over WebSocket
  • Five new game rules for portals, command blocks, PvP and spawning

Before you update a world: take a backup. A world opened in 1.21.9 cannot be opened in an older version again. How backups work here.

1.21.9 on FadeHost

The right Java, set for you
A 1.21.9 server needs Java 21, and the panel starts it with a Java that fits. Nothing to install, nothing to pick.
Server software for 1.21.9
PaperPurpurVanillaFabricForgeNeoForge
Who can join
Players on 1.21.9 and on 1.21.10: the network protocol is the same.
Start a 1.21.9 server

Patches after 1.21.9

The fix releases that followed, oldest first.

Minecraft 1.21.10

· Java 21

1.21.10 was a hotfix that cleared seven issues left by The Copper Age. The fixes covered piston and powder snow entity behavior, wind charge collisions, chunk loading during teleports and maps placed on walls.

What 1.21.10 changed

Questions about 1.21.9

When was Minecraft 1.21.9 released?

Minecraft: Java Edition 1.21.9, The Copper Age, was released on September 30, 2025.

What Java version does a Minecraft 1.21.9 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 1.21.9 add?

The Copper Age built copper out into a full tool, armor and decoration set and added the copper golem, which sorts items between chests. It also gave the End skylight, added shelves, and introduced a JSON-RPC management API for dedicated servers.

Can players on another version join a 1.21.9 server?

Players on 1.21.10 can: the network protocol (773) 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 1.21.9?

Yes. Take a backup, switch the server to 1.21.9 and start it: the world is converted on the first boot. A world opened in 1.21.9 cannot be opened in an older version again, so keep the backup until you are sure.

How do I start a Minecraft 1.21.9 server?

Create a server on FadeHost and pick 1.21.9 in the software list: Paper, Purpur, Vanilla, Fabric, Forge and NeoForge 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 1.21.8

July 17, 2025

The release after

Minecraft 1.21.10

October 7, 2025

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 1.21.9. Minecraft is a trademark of Mojang; FadeHost is not affiliated with Mojang or Microsoft.