Ukulib Mod Fabric Setup: Version Matching & Installation

A reliable Fabric setup starts with the dependent mod’s requirement, then works backward through Minecraft version, Ukulib release, and the exact launcher instance you intend to run.

Start with the dependent mod, not the download button

If another mod declares Ukulib as required, note the accepted Ukulib version range first. That requirement is more important than simply choosing the newest file available.

Read Ukulib version suffixes literally

The current version scheme appends the targeted Minecraft version after a plus sign. For example, 2.2.0+26.3 targets Minecraft 26.3, while the legacy 1.10.2+1.21.11 line targets Minecraft 1.21.11.

Match Fabric to the correct release line

Current 2.x documentation uses the ukulib-fabric artifact for Fabric projects. Older Minecraft 1.21.x profiles belong to the 1.x release family, so a current 2.x build should not be dropped into an older instance just because it has a larger version number.

Install into the launcher instance you actually use

Place the compatible built JAR in that instance’s mods folder, then verify the launcher profile points to the same directory. A surprisingly common “missing dependency” problem is editing one instance while launching another.

Test with a small required set

After changing a core library, launch with the dependent mod and its required dependencies before restoring a large mod list. If startup fails, the first relevant loader or dependency message is usually more useful than the last line of the crash report.

Do not use a source ZIP as the mod JAR

The source archive linked in this site’s download section contains repository source files. A normal Fabric profile expects the matching built mod JAR, not the source tree.

Continue with the site guides

Use the compatibility section to check versions, then review the troubleshooting section before changing several dependencies at once.