diff --git a/cli/scb-cli.scala b/cli/scb-cli.scala
index 23247fc2..1266c73c 100755
--- a/cli/scb-cli.scala
+++ b/cli/scb-cli.scala
@@ -31,7 +31,7 @@ class FailedProjectException(msg: String)
     with NoStackTrace
 
 val communityBuildVersion =
-  sys.props.getOrElse("communitybuild.version", "v0.3.16")
+  sys.props.getOrElse("communitybuild.version", "v0.3.17")
 private val CBRepoName = "VirtusLab/community-build3"
 val projectBuilderUrl =
   s"https://raw.githubusercontent.com/$CBRepoName/master/project-builder"
diff --git a/project-builder/mill/MillCommunityBuild.sc b/project-builder/mill/MillCommunityBuild.sc
index db543db4..6ec91b6d 100644
--- a/project-builder/mill/MillCommunityBuild.sc
+++ b/project-builder/mill/MillCommunityBuild.sc
@@ -1,5 +1,6 @@
+package build
 import $ivy.`com.lihaoyi::upickle:3.0.0`
-import $file.MillVersionCompat, MillVersionCompat.compat.{
+import MillVersionCompat.compat.{
   CoursierModule,
   JavaModule,
   PublishModule,
@@ -11,7 +12,7 @@ import $file.MillVersionCompat, MillVersionCompat.compat.{
   Val,
   toZincWorker
 }
-import $file.CommunityBuildCore, CommunityBuildCore.Scala3CommunityBuild.{
+import CommunityBuildCore.Scala3CommunityBuild.{
   TestingMode => _,
   ProjectBuildConfig => _,
   ProjectOverrides => _,
@@ -188,8 +189,8 @@ class MillTaskEvaluator()(implicit ctx: Ctx) extends TaskEvaluator[NamedTask] {
 
 // Main entry point for Mill community build
 // Evaluate tasks until first failure and publish report
-def runBuild(configJson: String, targets: Seq[String])(implicit ctx: Ctx) = {
-
+def runBuild(configJson: String, projectDir: String, targets: Seq[String])(implicit ctx: Ctx) = {
+  val outputDir: os.Path = os.Path.expandUser(projectDir) / os.up
   println(s"Build config: ${configJson}")
   val config = read[ProjectBuildConfig](configJson)
   println(s"Parsed config: ${config}")
@@ -305,7 +306,6 @@ def runBuild(configJson: String, targets: Seq[String])(implicit ctx: Ctx) = {
     |************************"
     |""".stripMargin)
 
-  val outputDir = os.pwd / os.up
   os.write.over(outputDir / "build-summary.txt", buildSummary.toJson)
 
   val failedModules = projectsBuildResults
diff --git a/project-builder/mill/build.sh b/project-builder/mill/build.sh
index a4a9e95b..2233f47b 100755
--- a/project-builder/mill/build.sh
+++ b/project-builder/mill/build.sh
@@ -25,6 +25,7 @@ echo Project projectConfig: $projectConfig
 echo '##################################'
 
 scriptDir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+projectDir=$PWD/$repoDir
 
 cd $repoDir
 
@@ -42,7 +43,7 @@ millSettings=(
 function tryBuild() {
   mill=$1
   echo "Try build using $mill"
-  $mill "${millSettings[@]}" runCommunityBuild "$scalaVersion" "${projectConfig}" "${targets[@]}"
+  $mill "${millSettings[@]}" runCommunityBuild --scalaVersion="$scalaVersion" --configJson="${projectConfig}" --projectDir=$projectDir "${targets[@]}"
 }
 
 
diff --git a/project-builder/mill/compat/0.12.sc b/project-builder/mill/compat/0.12.sc
new file mode 100644
index 00000000..40401993
--- /dev/null
+++ b/project-builder/mill/compat/0.12.sc
@@ -0,0 +1,16 @@
+package build
+// Same as 0.11
+object compat {
+  type CoursierModule = mill.scalalib.CoursierModule
+  type JavaModule = mill.scalalib.JavaModule
+  type PublishModule = mill.scalalib.PublishModule
+  type ScalaModule = mill.scalalib.ScalaModule
+  type TestModule = mill.scalalib.TestModule
+  type ZincWorkerModule = mill.scalalib.ZincWorkerModule
+  type TestResult = mill.testrunner.TestResult
+  type Val = mill.api.Val
+  val Val = mill.api.Val
+  type Task[+T] = mill.Task[T]
+
+  def toZincWorker(v: ZincWorkerModule) = mill.define.ModuleRef(v)
+}
\ No newline at end of file
diff --git a/project-builder/mill/prepare-project.sh b/project-builder/mill/prepare-project.sh
index e954a022..6c1082eb 100755
--- a/project-builder/mill/prepare-project.sh
+++ b/project-builder/mill/prepare-project.sh
@@ -16,7 +16,8 @@ export OPENCB_PROJECT_DIR=$repoDir
 
 scriptDir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
 
-MILL_0_11=0.11.6
+MILL_0_12="0.12.0-RC2"
+MILL_0_11=0.11.12
 MILL_0_10=0.10.15
 MILL_0_9=0.9.12
 RESOLVE="resolve _"
@@ -39,7 +40,7 @@ else
   fi
   if [[ "$millVersion" == "" ]]; then
     echo "Trying one of predefiend mill versions"
-    for v in $MILL_0_11 $MILL_0_10 $MILL_0_9; do
+    for v in $MILL_0_12 $MILL_0_11 $MILL_0_10 $MILL_0_9; do
       if `${scriptDir}/millw --mill-version $v $RESOLVE > /dev/null 2>/dev/null`; then
         echo "Successfully applied build using mill $v"
         millVersion=$v
@@ -63,8 +64,8 @@ echo "Detected mill version=$millVersion, binary version: $millBinaryVersion"
 millBinaryVersionMajor=`echo $millVersion | cut -d . -f 1`
 millBinaryVersionMinor=`echo $millVersion | cut -d . -f 2`
 # 0.9 is the minimal verified supported version
-# 0.12 does not exit yet
-if [[ "$millBinaryVersionMajor" -ne "0" || ( "$millBinaryVersionMinor" -lt "9" || "$millBinaryVersionMinor" -gt "11" ) ]]; then 
+# 0.13 does not exit yet
+if [[ "$millBinaryVersionMajor" -ne "0" || ( "$millBinaryVersionMinor" -lt "9" || "$millBinaryVersionMinor" -gt "12" ) ]]; then 
   echo "Unsupported mill version"
   exit 1
 fi
@@ -98,14 +99,18 @@ fi
 
 # Rename build.sc to build.scala - Scalafix does ignore .sc files
 # Use scala 3 dialect to allow for top level defs
-adaptedFiles=($PWD/build.sc )
+millBuildExt="mill"
+if [[ "$millBinaryVersionMajor" -eq "0" && "$millBinaryVersionMinor" -le "11" ]]; then 
+  millBuildExt=sc
+fi
+adaptedFiles=( $PWD/build.${millBuildExt} )
 if [[ -d ./project ]]; then
-  adaptedFiles+=(`find ./project -type f -name "*.sc"`)
+  adaptedFiles+=(`find ./project -type f -name "*.$millBuildExt"`)
 fi
-for scFile in "${adaptedFiles[@]}"; do 
-  echo "Apply scalafix rules to $scFile"
-  scalaFile="${scFile%.sc}.scala"
-  cp $scFile $scalaFile
+for buildFile in "${adaptedFiles[@]}"; do 
+  echo "Apply scalafix rules to $buildFile"
+  scalaFile="${buildFile%.$millBuildExt}.scala"
+  cp $buildFile $scalaFile
   scalafix \
     --rules file:${scriptDir}/scalafix/rules/src/main/scala/fix/Scala3CommunityBuildMillAdapter.scala \
     --files $scalaFile \
@@ -113,15 +118,28 @@ for scFile in "${adaptedFiles[@]}"; do
     --syntactic \
     --settings.Scala3CommunityBuildMillAdapter.targetScalaVersion "$scalaVersion" \
     --settings.Scala3CommunityBuildMillAdapter.millBinaryVersion "$millBinaryVersion" \
-    --scala-version 3.1.0 > ${scFile}.adapted \
-    && mv ${scFile}.adapted $scFile \
-    || (echo "Failed to adapted $scFile, ignoring changes"; cat ${scFile}.adapted; rm -f ${scFile}.adapted) 
+    --scala-version 3.1.0 > ${buildFile}.adapted \
+    && mv ${buildFile}.adapted $buildFile \
+    || (echo "Failed to adapt $buildFile, ignoring changes"; cat ${buildFile}.adapted; rm -f ${buildFile}.adapted) 
   rm $scalaFile
 done
 
 for f in "${adaptedFiles[@]}"; do
   dir="$(dirname $(realpath "$f"))"
-  ln -fs $scriptDir/../shared/CommunityBuildCore.scala ${dir}/CommunityBuildCore.sc
-  ln -fs $scriptDir/MillCommunityBuild.sc ${dir}/MillCommunityBuild.sc
-  ln -fs $scriptDir/compat/$millBinaryVersion.sc ${dir}/MillVersionCompat.sc
+  cp $scriptDir/MillCommunityBuild.sc ${dir}/MillCommunityBuild.$millBuildExt
+  cp $scriptDir/compat/$millBinaryVersion.sc ${dir}/MillVersionCompat.$millBuildExt
+
+  if [[ "$millBinaryVersionMajor" -gt "0" || "$millBinaryVersionMinor" -ge "12" ]]; then
+    # Compat for Mill 0.12+ sources
+    echo "package build" | cat - $scriptDir/../shared/CommunityBuildCore.scala > ${dir}/CommunityBuildCore.$millBuildExt
+  else  
+    # Compat for Mill 0.11+ sources
+    cp $scriptDir/../shared/CommunityBuildCore.scala ${dir}/CommunityBuildCore.$millBuildExt
+    for fileCopy in ${dir}/CommunityBuildCore.$millBuildExt ${dir}/MillCommunityBuild.$millBuildExt ${dir}/MillVersionCompat.$millBuildExt; do
+      scala-cli $scriptDir/../shared/searchAndReplace.scala -- $fileCopy "package build\n" ""
+      scala-cli $scriptDir/../shared/searchAndReplace.scala -- $fileCopy "import CommunityBuildCore." "import \$file.CommunityBuildCore, CommunityBuildCore."
+      scala-cli $scriptDir/../shared/searchAndReplace.scala -- $fileCopy "import MillVersionCompat." "import \$file.MillVersionCompat, MillVersionCompat."
+    done
+  fi
+
 done
diff --git a/project-builder/mill/scalafix/rules/src/main/scala/fix/Scala3CommunityBuildMillAdapter.scala b/project-builder/mill/scalafix/rules/src/main/scala/fix/Scala3CommunityBuildMillAdapter.scala
index 143979ae..12178c4f 100644
--- a/project-builder/mill/scalafix/rules/src/main/scala/fix/Scala3CommunityBuildMillAdapter.scala
+++ b/project-builder/mill/scalafix/rules/src/main/scala/fix/Scala3CommunityBuildMillAdapter.scala
@@ -54,7 +54,7 @@ class Scala3CommunityBuildMillAdapter(
     "Scala_3",
     "scala_3",
     "scala",
-    "Scala"
+    // "Scala" - explicitly ignored
   )
 
   val Scala3Literal = raw""""3.\d+.\d+(?:-RC\d+)?"""".r
diff --git a/project-builder/sbt/CommunityBuildPlugin.scala b/project-builder/sbt/CommunityBuildPlugin.scala
index 0804f5d5..4d7d0f5a 100644
--- a/project-builder/sbt/CommunityBuildPlugin.scala
+++ b/project-builder/sbt/CommunityBuildPlugin.scala
@@ -10,7 +10,7 @@ import scala.collection.JavaConverters._
 import scala.collection.mutable
 
 import Scala3CommunityBuild._
-import Scala3CommunityBuild.Utils._
+import Scala3CommunityBuild.Utils.{LibraryDependency, logOnce}
 import TaskEvaluator.EvalResult
 
 class SbtTaskEvaluator(val project: ProjectRef, private var state: State)
@@ -94,13 +94,12 @@ object CommunityBuildPlugin extends AutoPlugin {
   private def extraLibraryDependencies(
       buildScalaVersion: Option[String],
       projectScalaVersion: String
-  ) =
+  ): Seq[ModuleID] =
     if (!projectScalaVersion.startsWith("3.")) Nil
     else
-      Scala3CommunityBuild.Utils
-        .extraLibraryDependencies(buildScalaVersion.getOrElse(projectScalaVersion))
+      Utils.extraLibraryDependencies(buildScalaVersion.getOrElse(projectScalaVersion))
         .map {
-          case Scala3CommunityBuild.Utils.LibraryDependency(
+          case LibraryDependency(
                 org,
                 artifact,
                 version,
@@ -194,7 +193,7 @@ object CommunityBuildPlugin extends AutoPlugin {
         if (scalaVersion.startsWith("3.")) remove
         else remove ++ appendScala3Exclusive
 
-      Scala3CommunityBuild.Utils.mapScalacOptions(
+      Utils.mapScalacOptions(
         current = currentScalacOptions,
         append = filteredAppend,
         remove = filteredRemove
@@ -420,7 +419,7 @@ object CommunityBuildPlugin extends AutoPlugin {
         case "*%*" :: _ => originalModuleIds.keys.toSeq
         case ids        => ids
       }
-      val filteredIds = filterTargets(idsToUse, config.projects.exclude.map(_.r))
+      val filteredIds = Utils.filterTargets(idsToUse, config.projects.exclude.map(_.r))
 
       println("Starting build...")
       // Find projects that matches maven
diff --git a/scripts/bisect.scala b/scripts/bisect.scala
index 703b6fac..3f2b2d7f 100755
--- a/scripts/bisect.scala
+++ b/scripts/bisect.scala
@@ -9,7 +9,7 @@ import java.nio.file.attribute.PosixFilePermissions
 import java.nio.charset.StandardCharsets
 import java.nio.file._
 
-val communityBuildVersion = "v0.3.16"
+val communityBuildVersion = "v0.3.17"
 
 @main def run(args: String*): Unit =
   val config = scopt.OParser
diff --git a/scripts/build-all.sh b/scripts/build-all.sh
index daa37a2c..21aba87c 100755
--- a/scripts/build-all.sh
+++ b/scripts/build-all.sh
@@ -7,7 +7,7 @@ if [ $# -ne 1 ]; then
 fi
 
 VERSION="$1"
-export PREV_CB_VERSION="v0.3.15"
+export PREV_CB_VERSION="v0.3.16"
 
 javaDefault=11
 javaAccessoryVersions=(8 17 21)