diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6ea7678..3ed4636 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -35,7 +35,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        java: ['8', '17']
+        java: ['11', '17']
 
     steps:
     - uses: actions/checkout@v4
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 26c4d43..5ee4496 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -14,7 +14,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: '17'
+          java-version: '11'
       - run: ./mill io.kipp.mill.ci.release.ReleaseModule/publishAll
         env:
           PGP_PASSPHRASE: ${{ secrets.PGP_PASSPHRASE }}
diff --git a/.scalafix3.conf b/.scalafix3.conf
new file mode 100644
index 0000000..46931ae
--- /dev/null
+++ b/.scalafix3.conf
@@ -0,0 +1,18 @@
+rules = [ 
+  DisableSyntax,
+  OrganizeImports,
+  NoValInForComprehension,
+]
+
+OrganizeImports {
+  removeUnused = false
+  expandRelative = true
+  groupedImports = Explode
+  groups = [
+  "re:javax?\\."
+  "scala."
+  "ch.epfl"
+  "bloop"
+  "*"
+  ]
+}
diff --git a/build.sc b/build.sc
index 4c4c1a3..a2dc7c5 100644
--- a/build.sc
+++ b/build.sc
@@ -1,3 +1,4 @@
+import os.Path
 import $ivy.`com.github.lolgab::mill-mima::0.1.1`
 import $ivy.`com.github.lolgab::mill-crossplatform::0.2.4`
 import $ivy.`com.goyeau::mill-scalafix::0.4.0`
@@ -17,17 +18,16 @@ import io.kipp.mill.ci.release.CiReleaseModule
 
 val scala212 = "2.12.19"
 val scala213 = "2.13.14"
+val scala3 = "3.3.4"
 
-val scalaJS1 = "1.16.0"
+val scalaJS1 = "1.17.0"
 
-val scalaVersions = List(scala212, scala213)
+val scalaVersions = List(scala212, scala213, scala3)
 
 trait CommonPublish extends CiReleaseModule with Mima {
 
   override def artifactName = "bloop-config"
 
-  override def mimaPreviousVersions = Seq("2.0.2")
-
   override def pomSettings = PomSettings(
     description = "Bloop configuration library.",
     organization = "ch.epfl.scala",
@@ -47,9 +47,14 @@ trait CommonPublish extends CiReleaseModule with Mima {
 
 trait Common extends CrossScalaModule with ScalafmtModule with ScalafixModule {
 
-  val jsoniterVersion = "2.4.0"
+  val jsoniterVersion = "2.30.14"
   val unrollVersion = "0.1.12"
 
+  override def scalafixConfig: T[Option[Path]] = T {
+     if (scalaVersion() == scala3) Some(os.pwd / ".scalafix3.conf")
+     else Some(os.pwd / ".scalafix.conf")
+  }
+  
   override def ivyDeps = Agg(
     ivy"com.github.plokhotnyuk.jsoniter-scala::jsoniter-scala-core::$jsoniterVersion",
     ivy"com.lihaoyi::unroll-annotation:$unrollVersion"
@@ -72,11 +77,26 @@ trait CommonTest extends ScalaModule with TestModule.Munit {
 }
 
 object config extends Cross[ConfigModule](scalaVersions)
+
 trait ConfigModule extends CrossPlatform {
   trait Shared
       extends CrossPlatformCrossScalaModule
       with Common
-      with CommonPublish
+      with CommonPublish {
+
+    // note: somehow, this doesn't work (causes "Please override mimaPreviousVersions or mimaPreviousArtifacts")
+    // override def mimaPreviousVersions: Target[Seq[String]] =
+    //   T {
+    //     if (scalaVersion() == scala3) Seq.empty[String] else Seq("2.0.2")
+    //   }
+    // so we have to override mimaPreviousArtifacts fully:
+    // at least until the Scala 3 release is published.
+
+    override def mimaPreviousArtifacts: Target[Agg[Dep]] = T {
+      if (scalaVersion() == scala3) Agg.empty[Dep]
+      else Agg(ivy"ch.epfl.scala::bloop-config::2.0.2")
+    }
+  }
 
   object jvm extends Shared {
     object test extends CrossPlatformSources with ScalaTests with CommonTest
diff --git a/config/src-2/bloop/config/SourceGeneratorCompanionPlatform.scala b/config/src-2/bloop/config/SourceGeneratorCompanionPlatform.scala
new file mode 100644
index 0000000..8f6fb21
--- /dev/null
+++ b/config/src-2/bloop/config/SourceGeneratorCompanionPlatform.scala
@@ -0,0 +1,12 @@
+package bloop.config
+
+import scala.runtime.AbstractFunction3
+
+// needed for binary compat with 2.0.2
+trait SourceGeneratorCompanionPlatform
+    extends AbstractFunction3[
+      List[Config.SourcesGlobs],
+      PlatformFiles.Path,
+      List[String],
+      Config.SourceGenerator
+    ] {}
diff --git a/config/src-3/bloop/config/SourceGeneratorCompanionPlatform.scala b/config/src-3/bloop/config/SourceGeneratorCompanionPlatform.scala
new file mode 100644
index 0000000..25b8378
--- /dev/null
+++ b/config/src-3/bloop/config/SourceGeneratorCompanionPlatform.scala
@@ -0,0 +1,3 @@
+package bloop.config
+
+trait SourceGeneratorCompanionPlatform {}
diff --git a/config/src/bloop/config/Config.scala b/config/src/bloop/config/Config.scala
index 5d90c08..eff3a15 100644
--- a/config/src/bloop/config/Config.scala
+++ b/config/src/bloop/config/Config.scala
@@ -1,7 +1,6 @@
 package bloop.config
 
 import scala.annotation.unroll
-import scala.runtime.AbstractFunction3
 
 import bloop.config.PlatformFiles.Path
 import bloop.config.PlatformFiles.emptyPath
@@ -284,14 +283,7 @@ object Config {
       @unroll unmanagedInputs: List[Path] = Nil
   )
 
-  object SourceGenerator
-  // needed for binary compat with 2.0.2
-      extends AbstractFunction3[
-        List[SourcesGlobs],
-        Path,
-        List[String],
-        SourceGenerator
-      ]
+  object SourceGenerator extends SourceGeneratorCompanionPlatform
 
   case class Project(
       name: String,
@@ -364,7 +356,7 @@ object Config {
       val platformJS = {
         Platform.Js(
           JsConfig(
-            "1.16.0",
+            "1.17.0",
             LinkerMode.Release,
             ModuleKindJS.ESModule,
             false,