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Unstable GenerationMinecraft mod for 1.21.11

Unstable World Generation perfectly replicates the iconic landscape progression of the Unstable SMP.

client and servernewest supported 1.21.11Worldgen
Latest version
1.0.7
Minecraft
1.21.5 to 1.21.11
Java
Java 21+
Loader
Fabric
Licence
LicenseRef-All-Rights-Reserved
Downloads
34.6k
Updated
2 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Unstable Generation servers

One click and Unstable Generation is installed with the right loader, on hardware built for it.

  • 1.21.11
  • Fabric
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

Every version Unstable Generation declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.11Fabric21+declared9 Dec 2025
1.21.10Fabric21+declared7 Oct 2025
1.21.9Fabric21+declared30 Sept 2025
1.21.8Fabric21+declared17 Jul 2025
1.21.7Fabric21+declared30 Jun 2025
1.21.6Fabric21+declared17 Jun 2025
1.21.5Fabric21+declared25 Mar 2025

Download

From Unstable Generation’s own host. Nothing is re-hosted here.

1.0.7release5 Jul 2026

unstable-generation-1.0.7.jar · 0.2 MB · for 1.21.11

Download latest
56322e02f220…
Older versions4
  • 1.0.618 May 20261.21.110.1 MB2.8k downloadsdd3345713864…Get
  • 1.0.54 May 20261.21.1197 KB2.7k downloads224346f635ab…Get
  • 1.0.427 Apr 20261.21.1167 KB867 downloadsda34bbbb4176…Get
  • 1.0.020 Apr 20261.21.1156 KB46 downloadsdf174ec764a5…Get

Frequently asked

Does Unstable Generation work on Minecraft 1.21.11?

Yes. 1.21.11 is the newest Minecraft version Unstable Generation declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does Unstable Generation support?

Everything the author has declared, from 1.21.5 up to 1.21.11. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Unstable Generation on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which platform or loader does Unstable Generation support?

Fabric. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Unstable Generation?

On the newest Minecraft version it supports, Java 21 or newer. The requirement comes from the Minecraft version you run rather than from the mod itself, so on an older supported Minecraft the answer is that version's Java, not this one.

What licence is Unstable Generation under?

LicenseRef-All-Rights-Reserved, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install Unstable Generation?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download Unstable Generation safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. The download link goes to the source recorded for that release; verify the publisher, filename and checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftJourneyMapReal-time map used for mapping in-game or your browser as you explore.Architectury APIAn intermediary api aimed to ease developing multiplatform mods.Jade 🔍Shows information about what you are looking at. (Hwyla/WAILA fork for Minecraft 1.16+)Collective🎓 Collective is a shared library with common code for all of Serilum's mods.ComfortsAdds sleeping bags and hammocks for, respectively, portability and turning day to night, without setting new spawns. Comes in 16 different colors!

Last checked 2 mo ago against Modrinth. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .