A mod that provides the Sponge Mixin library, a standard API for mods to load mixins targeting Minecraft and other mods, and associated useful utilities on 1.8 - 1.12.2.

For Developers:

  • Add CleanroomMC's repository and depend on MixinBooter's maven entry:
repositories {
    maven {
        url 'https://maven.cleanroommc.com'

dependencies {
    implementation 'zone.rong:mixinbooter:8.4'


  • As of 4.2, MixinBooter's API has changed and all mods that uses mixins are encouraged to depend on MixinBooter, even those that mixin into vanilla/forge/library classes. To avoid mixin version mismatches with mods crashing trying to implement modded mixins (looking at you VanillaFix). Thanks to @embeddedt recommending and helping me introduce this change!

  • As of 5.0, MixinExtras by @LlamaLad7 is shaded. Available for developers to use.

  • As of 8.0, MixinBooter will now work from 1.8 - 1.12.2. One single build works with all these versions! (TODO: LiteLoader support?)


  • Consult IEarlyMixinLoader for mixins that affects vanilla, forge, or any classes that is passed to the classloader extremely early (e.g. Guava).
  • Consult ILateMixinLoader for mixins that affects mods.
  • @MixinLoader annotation is, as of 4.2, deprecated. The functionality is akin to ILateMixinLoader.