diff --git a/.gitignore b/.gitignore
index 100086e..d93ce81 100644
--- a/.gitignore
+++ b/.gitignore
@@ -32,3 +32,4 @@ cs
 .metals/
 .bloop/
 .idea*
+.bsp
diff --git a/.mill-version b/.mill-version
deleted file mode 100644
index 78bc1ab..0000000
--- a/.mill-version
+++ /dev/null
@@ -1 +0,0 @@
-0.10.0
diff --git a/.scalafmt.conf b/.scalafmt.conf
index 43e9529..a0fa1d8 100644
--- a/.scalafmt.conf
+++ b/.scalafmt.conf
@@ -1,2 +1,2 @@
-version = 3.4.3
+version = "3.8.3"
 runner.dialect = scala213source3
diff --git a/build.sc b/build.sc
index c83d2ab..d2b9c48 100644
--- a/build.sc
+++ b/build.sc
@@ -1,34 +1,44 @@
+//| mill-version: 1.0.3
+
 // -*- mode: scala -*-
+package build
 
-import mill._, os._, scalalib._, publish._
+import mill.*, os.*, scalalib.*, publish.*
+import mill.util.BuildInfo.{millVersion, millBinPlatform}
 import scala.util.Properties
 
 object meta {
 
-  val crossVersions = Seq("2.13.8")
-
-  implicit val wd: Path = pwd
-
   def nonEmpty(s: String): Option[String] = s.trim match {
     case v if v.isEmpty => None
-    case v => Some(v)
+    case v              => Some(v)
   }
 
-  val MILL_VERSION = Properties.propOrNull("MILL_VERSION")
   val versionFromEnv = Properties.propOrNone("PUBLISH_VERSION")
-  val gitSha = nonEmpty(proc("git", "rev-parse", "--short", "HEAD").call().out.trim)
-  val gitTag = nonEmpty(proc("git", "tag", "-l", "-n0", "--points-at", "HEAD").call().out.trim)
-  val publishVersion = (versionFromEnv orElse gitTag orElse gitSha).getOrElse("latest")
+  val gitSha = nonEmpty(
+    os.call(Seq("git", "rev-parse", "--short", "HEAD")).out.text().trim()
+  )
+  val gitTag = nonEmpty(
+    os.call(Seq("git", "tag", "-l", "-n0", "--points-at", "HEAD"))
+      .out
+      .text()
+      .trim()
+  )
+  val publishVersion =
+    (versionFromEnv orElse gitTag orElse gitSha).getOrElse("latest")
 }
 
-object dotenv extends Cross[Dotenv](meta.crossVersions: _*)
-class Dotenv(val crossScalaVersion: String) extends CrossScalaModule with PublishModule { self =>
-  def publishVersion = meta.publishVersion
+object dotenv extends ScalaModule with PublishModule {
+
+  override def scalaVersion = "3.7.1"
 
-  def artifactName = "mill-dotenv"
+  override def publishVersion = meta.publishVersion
 
-  def pomSettings = PomSettings(
-    description = "mill support for twelve-factor apps. load environment variables from .env",
+  override def artifactName = "mill-dotenv"
+
+  override def pomSettings = PomSettings(
+    description =
+      "mill support for twelve-factor apps. load environment variables from .env",
     organization = "com.github.vic",
     url = "https://github.com/vic/mill-dotenv",
     licenses = Seq(License.`Apache-2.0`),
@@ -38,11 +48,9 @@ class Dotenv(val crossScalaVersion: String) extends CrossScalaModule with Publis
     )
   )
 
-  def compileIvyDeps = Agg(
-    ivy"com.lihaoyi::mill-scalalib:${meta.MILL_VERSION}"
-  )
+  override def mvnDeps = Seq(mvn"com.lihaoyi::mill-libs:$millVersion")
 
-  object tests extends Tests with TestModule.Utest {
-    def ivyDeps = Agg(ivy"com.lihaoyi::utest:0.7.11") ++ self.compileIvyDeps()
+  object tests extends ScalaTests, TestModule.Utest {
+    override def mvnDeps = Seq(mvn"com.lihaoyi::mill-testkit:$millVersion")
   }
 }
diff --git a/ci b/ci
index fe977d8..21f811e 100755
--- a/ci
+++ b/ci
@@ -11,35 +11,27 @@ function die {
 case "$1" in
 
  jitpack)
-   exec $0 mill -j 0 __.publishM2Local
+   $BASE_DIR/mill -j 0 __.publishM2Local
  ;;
 
  mill)
-   exec $0 cs launch --scala 2.13.8  mill -- "${@:2}"
+   $BASE_DIR/mill "${@:2}"
  ;;
 
  mill-i)
-   exec $0 cs launch --scala 2.13.8 mill-interactive -- -i "${@:2}"
+   $BASE_DIR/mill -i "${@:2}"
  ;;
 
  scalafmt)
-   exec $0 cs launch --scala 2.13.8 scalafmt -- --diff "${@:2}"
+   $0 mill mill.scalalib.scalafmt/
  ;;
 
  scalafmt-test)
-   $0 scalafmt --test
- ;;
-
- cs)
-   test -x $BASE_DIR/cs || {
-     curl -o $BASE_DIR/cs -qL https://git.io/coursier-cli
-     chmod +x $BASE_DIR/cs
-   }
-   exec $BASE_DIR/cs "${@:2}"
+   $0 mill mill.scalalib.scalafmt/checkFormatAll
  ;;
 
  example)
-  $0 mill-i -j 0 -D PUBLISH_VERSION=latest __.publishLocal
+  $0 mill-i -j 0 -DPUBLISH_VERSION=latest __.publishLocal
   (cd example; ../ci mill hello.run)
   (cd example; ../ci mill hello.tests)
  ;;
diff --git a/dotenv/src/DotEnvModule.scala b/dotenv/src/DotEnvModule.scala
index 5016b30..91d1e1a 100644
--- a/dotenv/src/DotEnvModule.scala
+++ b/dotenv/src/DotEnvModule.scala
@@ -1,23 +1,29 @@
 package mill.dotenv
 
 import mill._
-import scalalib._
-
+import mill.scalalib._
+import os.Path
+import mill.api.BuildCtx
 
 object DotEnvModule {
 
-  def parse(pathRef: PathRef):Map[String,String] = {
+  def parse(pathRef: PathRef): Map[String, String] = {
     parse(os.read(pathRef.path))
   }
 
-  def parse(source: String): Map[String, String] = LINE_REGEX.findAllMatchIn(source)
-    .map(keyValue => (keyValue.group(1), unescapeCharacters(removeQuotes(keyValue.group(2)))))
+  def parse(source: String): Map[String, String] = LINE_REGEX
+    .findAllMatchIn(source)
+    .map(keyValue =>
+      (keyValue.group(1), unescapeCharacters(removeQuotes(keyValue.group(2))))
+    )
     .toMap
 
   private def removeQuotes(value: String): String = {
     value.trim match {
-      case quoted if quoted.startsWith("'") && quoted.endsWith("'") => quoted.substring(1, quoted.length - 1)
-      case quoted if quoted.startsWith("\"") && quoted.endsWith("\"") => quoted.substring(1, quoted.length - 1)
+      case quoted if quoted.startsWith("'") && quoted.endsWith("'") =>
+        quoted.substring(1, quoted.length - 1)
+      case quoted if quoted.startsWith("\"") && quoted.endsWith("\"") =>
+        quoted.substring(1, quoted.length - 1)
       case unquoted => unquoted
     }
   }
@@ -54,16 +60,19 @@ object DotEnvModule {
        (?:$|\z)           # end of line
     """.r
 
-
 }
 
-trait DotEnvModule extends JavaModule {
+trait DotEnvModule extends mill.javalib.JavaModule {
 
-  def dotenvSources = T.sources { os.pwd / ".env" }
+  def dotenvSources = Task.Sources { BuildCtx.workspaceRoot / ".env" }
 
-  def dotenv = T.input {
-    dotenvSources().map(DotEnvModule.parse).foldLeft(Map[String,String]()) { _ ++ _ }
-  }
+  def dotenv = dotenvSources
+    .map(
+      _.map(DotEnvModule.parse)
+        .foldLeft(Map[String, String]()) {
+          _ ++ _
+        }
+    )
 
   override def forkEnv = super.forkEnv() ++ dotenv()
 }
diff --git a/dotenv/tests/src/DotEnvModuleTests.scala b/dotenv/tests/src/DotEnvModuleTests.scala
index e58e37f..d74f4c6 100644
--- a/dotenv/tests/src/DotEnvModuleTests.scala
+++ b/dotenv/tests/src/DotEnvModuleTests.scala
@@ -5,26 +5,38 @@ import utest._
 object DotEnvModuleTests extends TestSuite {
   val tests = Tests {
 
-    "should remove quotes from value" - {
-      assert_env("HELLO", "WORLD", """
+    test("should remove quotes from value") - {
+      assert_env(
+        "HELLO",
+        "WORLD",
+        """
 HELLO="WORLD"
-""")
+"""
+      )
     }
 
-    "should allow dot as key name" - {
-      assert_env("HELL.O", "WORLD", """
+    test("should allow dot as key name") - {
+      assert_env(
+        "HELL.O",
+        "WORLD",
+        """
 HELL.O=WORLD
-""")
+"""
+      )
     }
 
-    "should allow new lines on value" - {
-      assert_env("HELLO", "BEAUTIFUL\nWORLD", """
+    test("should allow new lines on value") - {
+      assert_env(
+        "HELLO",
+        "BEAUTIFUL\nWORLD",
+        """
 HELLO="BEAUTIFUL
 WORLD"
-""")
+"""
+      )
     }
 
-    "should ignore commented values" - {
+    test("should ignore commented values") - {
       val env = DotEnvModule.parse("#FOO=BAR")
       assert(None == env.get("FOO"))
     }
diff --git a/example/build.sc b/example/build.sc
index 614cc1b..974d805 100644
--- a/example/build.sc
+++ b/example/build.sc
@@ -1,20 +1,24 @@
-// -*- mode: scala -*-
+//| mvnDeps: ["com.github.vic::mill-dotenv:latest"]
+//| mill-version: 1.0.3
 
-import $ivy.`com.github.vic::mill-dotenv:latest` // Change to fixed release
+// -*- mode: scala -*-
+package build
 
 import mill._, scalalib._, mill.dotenv._
+import mill.api.BuildCtx
 
 object hello extends ScalaModule with DotEnvModule {
   override def scalaVersion = scala.util.Properties.versionNumberString
-  override def finalMainClass = T("hello.Main")
+  override def finalMainClass = Task("hello.Main")
 
   // by default dotenv will read `$PWD/.env` file
   // unless `def dotenvSources` is overriden.
 
-  object tests extends Tests with DotEnvModule with TestModule.Utest {
+  object tests extends ScalaTests with DotEnvModule with TestModule.Utest {
     // load.env-test for test environment
-    override def dotenvSources = T.sources { os.pwd / ".env-test" }
-
-    def ivyDeps = Agg(ivy"com.lihaoyi::utest::0.7.11")
+    override def dotenvSources = Task.Sources {
+      BuildCtx.workspaceRoot / ".env-test"
+    }
+    override def mvnDeps = Seq(mvn"com.lihaoyi::utest:0.9.0")
   }
 }
diff --git a/example/hello/tests/src/HelloTests.scala b/example/hello/tests/src/HelloTests.scala
index ecc649f..253f663 100644
--- a/example/hello/tests/src/HelloTests.scala
+++ b/example/hello/tests/src/HelloTests.scala
@@ -3,8 +3,8 @@ package hello
 import utest._
 
 object HelloTests extends TestSuite {
-  val tests = Tests{
-    'world - {
+  val tests = Tests {
+    test("world") - {
       assert("monde" == sys.env("WORLD"))
     }
   }
diff --git a/mill b/mill
new file mode 100755
index 0000000..4a0cb64
--- /dev/null
+++ b/mill
@@ -0,0 +1,333 @@
+#!/usr/bin/env sh
+
+# This is a wrapper script, that automatically selects or downloads Mill from Maven Central or GitHub release pages.
+#
+# This script determines the Mill version to use by trying these sources
+#   - env-variable `MILL_VERSION`
+#   - local file `.mill-version`
+#   - local file `.config/mill-version`
+#   - `mill-version` from YAML fronmatter of current buildfile
+#   - if accessible, find the latest stable version available on Maven Central (https://repo1.maven.org/maven2)
+#   - env-variable `DEFAULT_MILL_VERSION`
+#
+# If a version has the suffix '-native' a native binary will be used.
+# If a version has the suffix '-jvm' an executable jar file will be used, requiring an already installed Java runtime.
+# If no such suffix is found, the script will pick a default based on version and platform.
+#
+# Once a version was determined, it tries to use either
+#    - a system-installed mill, if found and it's version matches
+#    - an already downloaded version under ~/.cache/mill/download
+#
+# If no working mill version was found on the system,
+# this script downloads a binary file from Maven Central or Github Pages (this is version dependent)
+# into a cache location (~/.cache/mill/download).
+#
+# Mill Project URL: https://github.com/com-lihaoyi/mill
+# Script Version: 1.0.0-M1-21-7b6fae-DIRTY892b63e8
+#
+# If you want to improve this script, please also contribute your changes back!
+# This script was generated from: dist/scripts/src/mill.sh
+#
+# Licensed under the Apache License, Version 2.0
+
+set -e
+
+if [ "$1" = "--setup-completions" ] ; then
+  # Need to preserve the first position of those listed options
+  MILL_FIRST_ARG=$1
+  shift
+fi
+
+if [ -z "${DEFAULT_MILL_VERSION}" ] ; then
+  DEFAULT_MILL_VERSION="0.12.10"
+fi
+
+
+if [ -z "${GITHUB_RELEASE_CDN}" ] ; then
+  GITHUB_RELEASE_CDN=""
+fi
+
+
+MILL_REPO_URL="https://github.com/com-lihaoyi/mill"
+
+if [ -z "${CURL_CMD}" ] ; then
+  CURL_CMD=curl
+fi
+
+# Explicit commandline argument takes precedence over all other methods
+if [ "$1" = "--mill-version" ] ; then
+    echo "The --mill-version option is no longer supported." 1>&2
+fi
+
+MILL_BUILD_SCRIPT=""
+
+if [ -f "build.mill" ] ; then
+  MILL_BUILD_SCRIPT="build.mill"
+elif [ -f "build.mill.scala" ] ; then
+  MILL_BUILD_SCRIPT="build.mill.scala"
+elif [ -f "build.sc" ] ; then
+  MILL_BUILD_SCRIPT="build.sc"
+fi
+
+# Please note, that if a MILL_VERSION is already set in the environment,
+# We reuse it's value and skip searching for a value.
+
+# If not already set, read .mill-version file
+if [ -z "${MILL_VERSION}" ] ; then
+  if [ -f ".mill-version" ] ; then
+    MILL_VERSION="$(tr '\r' '\n' < .mill-version | head -n 1 2> /dev/null)"
+  elif [ -f ".config/mill-version" ] ; then
+    MILL_VERSION="$(tr '\r' '\n' < .config/mill-version | head -n 1 2> /dev/null)"
+  elif [ -n "${MILL_BUILD_SCRIPT}" ] ; then
+    MILL_VERSION="$(cat ${MILL_BUILD_SCRIPT} | grep '//[|]  *mill-version:  *' | sed 's;//|  *mill-version:  *;;')"
+  fi
+fi
+
+MILL_USER_CACHE_DIR="${XDG_CACHE_HOME:-${HOME}/.cache}/mill"
+
+if [ -z "${MILL_DOWNLOAD_PATH}" ] ; then
+  MILL_DOWNLOAD_PATH="${MILL_USER_CACHE_DIR}/download"
+fi
+
+# If not already set, try to fetch newest from Github
+if [ -z "${MILL_VERSION}" ] ; then
+  # TODO: try to load latest version from release page
+  echo "No mill version specified." 1>&2
+  echo "You should provide a version via a '//| mill-version: ' comment or a '.mill-version' file." 1>&2
+
+  mkdir -p "${MILL_DOWNLOAD_PATH}"
+  LANG=C touch -d '1 hour ago' "${MILL_DOWNLOAD_PATH}/.expire_latest" 2>/dev/null || (
+    # we might be on OSX or BSD which don't have -d option for touch
+    # but probably a -A [-][[hh]mm]SS
+    touch "${MILL_DOWNLOAD_PATH}/.expire_latest"; touch -A -010000 "${MILL_DOWNLOAD_PATH}/.expire_latest"
+  ) || (
+    # in case we still failed, we retry the first touch command with the intention
+    # to show the (previously suppressed) error message
+    LANG=C touch -d '1 hour ago' "${MILL_DOWNLOAD_PATH}/.expire_latest"
+  )
+
+  # POSIX shell variant of bash's -nt operator, see https://unix.stackexchange.com/a/449744/6993
+  # if [ "${MILL_DOWNLOAD_PATH}/.latest" -nt "${MILL_DOWNLOAD_PATH}/.expire_latest" ] ; then
+  if [ -n "$(find -L "${MILL_DOWNLOAD_PATH}/.latest" -prune -newer "${MILL_DOWNLOAD_PATH}/.expire_latest")" ]; then
+    # we know a current latest version
+    MILL_VERSION=$(head -n 1 "${MILL_DOWNLOAD_PATH}"/.latest 2> /dev/null)
+  fi
+
+  if [ -z "${MILL_VERSION}" ] ; then
+    # we don't know a current latest version
+    echo "Retrieving latest mill version ..." 1>&2
+    LANG=C ${CURL_CMD} -s -i -f -I ${MILL_REPO_URL}/releases/latest 2> /dev/null  | grep --ignore-case Location: | sed s'/^.*tag\///' | tr -d '\r\n' > "${MILL_DOWNLOAD_PATH}/.latest"
+    MILL_VERSION=$(head -n 1 "${MILL_DOWNLOAD_PATH}"/.latest 2> /dev/null)
+  fi
+
+  if [ -z "${MILL_VERSION}" ] ; then
+    # Last resort
+    MILL_VERSION="${DEFAULT_MILL_VERSION}"
+    echo "Falling back to hardcoded mill version ${MILL_VERSION}" 1>&2
+  else
+    echo "Using mill version ${MILL_VERSION}" 1>&2
+  fi
+fi
+
+MILL_NATIVE_SUFFIX="-native"
+MILL_JVM_SUFFIX="-jvm"
+FULL_MILL_VERSION=$MILL_VERSION
+ARTIFACT_SUFFIX=""
+set_artifact_suffix(){
+  if [ "$(expr substr $(uname -s) 1 5 2>/dev/null)" = "Linux" ]; then
+    if [ "$(uname -m)" = "aarch64" ]; then
+      ARTIFACT_SUFFIX="-native-linux-aarch64"
+    else
+      ARTIFACT_SUFFIX="-native-linux-amd64"
+    fi
+  elif [ "$(uname)" = "Darwin" ]; then
+    if [ "$(uname -m)" = "arm64" ]; then
+      ARTIFACT_SUFFIX="-native-mac-aarch64"
+    else
+      ARTIFACT_SUFFIX="-native-mac-amd64"
+    fi
+  else
+     echo "This native mill launcher supports only Linux and macOS." 1>&2
+     exit 1
+  fi
+}
+
+case "$MILL_VERSION" in
+    *"$MILL_NATIVE_SUFFIX")
+  MILL_VERSION=${MILL_VERSION%"$MILL_NATIVE_SUFFIX"}
+  set_artifact_suffix
+  ;;
+
+    *"$MILL_JVM_SUFFIX")
+    MILL_VERSION=${MILL_VERSION%"$MILL_JVM_SUFFIX"}
+  ;;
+
+    *)
+  case "$MILL_VERSION" in
+    0.1.*) ;;
+    0.2.*) ;;
+    0.3.*) ;;
+    0.4.*) ;;
+    0.5.*) ;;
+    0.6.*) ;;
+    0.7.*) ;;
+    0.8.*) ;;
+    0.9.*) ;;
+    0.10.*) ;;
+    0.11.*) ;;
+    0.12.*) ;;
+    *)
+      set_artifact_suffix
+  esac
+  ;;
+esac
+
+MILL="${MILL_DOWNLOAD_PATH}/$MILL_VERSION$ARTIFACT_SUFFIX"
+
+try_to_use_system_mill() {
+  if [ "$(uname)" != "Linux" ]; then
+    return 0
+  fi
+
+  MILL_IN_PATH="$(command -v mill || true)"
+
+  if [ -z "${MILL_IN_PATH}" ]; then
+    return 0
+  fi
+
+  SYSTEM_MILL_FIRST_TWO_BYTES=$(head --bytes=2 "${MILL_IN_PATH}")
+  if [ "${SYSTEM_MILL_FIRST_TWO_BYTES}" = "#!" ]; then
+	  # MILL_IN_PATH is (very likely) a shell script and not the mill
+	  # executable, ignore it.
+	  return 0
+  fi
+
+  SYSTEM_MILL_PATH=$(readlink -e "${MILL_IN_PATH}")
+  SYSTEM_MILL_SIZE=$(stat --format=%s "${SYSTEM_MILL_PATH}")
+  SYSTEM_MILL_MTIME=$(stat --format=%y "${SYSTEM_MILL_PATH}")
+
+  if [ ! -d "${MILL_USER_CACHE_DIR}" ]; then
+    mkdir -p "${MILL_USER_CACHE_DIR}"
+  fi
+
+  SYSTEM_MILL_INFO_FILE="${MILL_USER_CACHE_DIR}/system-mill-info"
+  if [ -f "${SYSTEM_MILL_INFO_FILE}" ]; then
+    parseSystemMillInfo() {
+        LINE_NUMBER="${1}"
+        # Select the line number of the SYSTEM_MILL_INFO_FILE, cut the
+        # variable definition in that line in two halves and return
+        # the value, and finally remove the quotes.
+        sed -n "${LINE_NUMBER}p" "${SYSTEM_MILL_INFO_FILE}" |\
+            cut -d= -f2 |\
+            sed 's/"\(.*\)"/\1/'
+    }
+
+    CACHED_SYSTEM_MILL_PATH=$(parseSystemMillInfo 1)
+    CACHED_SYSTEM_MILL_VERSION=$(parseSystemMillInfo 2)
+    CACHED_SYSTEM_MILL_SIZE=$(parseSystemMillInfo 3)
+    CACHED_SYSTEM_MILL_MTIME=$(parseSystemMillInfo 4)
+
+    if [ "${SYSTEM_MILL_PATH}" = "${CACHED_SYSTEM_MILL_PATH}" ] \
+           && [ "${SYSTEM_MILL_SIZE}" = "${CACHED_SYSTEM_MILL_SIZE}" ] \
+           && [ "${SYSTEM_MILL_MTIME}" = "${CACHED_SYSTEM_MILL_MTIME}" ]; then
+      if [ "${CACHED_SYSTEM_MILL_VERSION}" = "${MILL_VERSION}" ]; then
+          MILL="${SYSTEM_MILL_PATH}"
+          return 0
+      else
+          return 0
+      fi
+    fi
+  fi
+
+  SYSTEM_MILL_VERSION=$(${SYSTEM_MILL_PATH} --version | head -n1 | sed -n 's/^Mill.*version \(.*\)/\1/p')
+
+  cat <<EOF > "${SYSTEM_MILL_INFO_FILE}"
+CACHED_SYSTEM_MILL_PATH="${SYSTEM_MILL_PATH}"
+CACHED_SYSTEM_MILL_VERSION="${SYSTEM_MILL_VERSION}"
+CACHED_SYSTEM_MILL_SIZE="${SYSTEM_MILL_SIZE}"
+CACHED_SYSTEM_MILL_MTIME="${SYSTEM_MILL_MTIME}"
+EOF
+
+  if [ "${SYSTEM_MILL_VERSION}" = "${MILL_VERSION}" ]; then
+    MILL="${SYSTEM_MILL_PATH}"
+  fi
+}
+try_to_use_system_mill
+
+# If not already downloaded, download it
+if [ ! -s "${MILL}" ] || [ "$MILL_TEST_DRY_RUN_LAUNCHER_SCRIPT" = "1" ] ; then
+  case $MILL_VERSION in
+    0.0.* | 0.1.* | 0.2.* | 0.3.* | 0.4.* )
+      DOWNLOAD_SUFFIX=""
+      DOWNLOAD_FROM_MAVEN=0
+      ;;
+    0.5.* | 0.6.* | 0.7.* | 0.8.* | 0.9.* | 0.10.* | 0.11.0-M* )
+      DOWNLOAD_SUFFIX="-assembly"
+      DOWNLOAD_FROM_MAVEN=0
+      ;;
+    *)
+      DOWNLOAD_SUFFIX="-assembly"
+      DOWNLOAD_FROM_MAVEN=1
+      ;;
+  esac
+  case $MILL_VERSION in
+    0.12.0 | 0.12.1 | 0.12.2 | 0.12.3 | 0.12.4 | 0.12.5 | 0.12.6 | 0.12.7 | 0.12.8 | 0.12.9 | 0.12.10 | 0.12.11 )
+      DOWNLOAD_EXT="jar"
+      ;;
+    0.12.* )
+      DOWNLOAD_EXT="exe"
+      ;;
+    0.* )
+      DOWNLOAD_EXT="jar"
+      ;;
+    *)
+      DOWNLOAD_EXT="exe"
+      ;;
+  esac
+
+  DOWNLOAD_FILE=$(mktemp mill.XXXXXX)
+  if [ "$DOWNLOAD_FROM_MAVEN" = "1" ] ; then
+    DOWNLOAD_URL="https://repo1.maven.org/maven2/com/lihaoyi/mill-dist${ARTIFACT_SUFFIX}/${MILL_VERSION}/mill-dist${ARTIFACT_SUFFIX}-${MILL_VERSION}.${DOWNLOAD_EXT}"
+  else
+    MILL_VERSION_TAG=$(echo "$MILL_VERSION" | sed -E 's/([^-]+)(-M[0-9]+)?(-.*)?/\1\2/')
+    DOWNLOAD_URL="${GITHUB_RELEASE_CDN}${MILL_REPO_URL}/releases/download/${MILL_VERSION_TAG}/${MILL_VERSION}${DOWNLOAD_SUFFIX}"
+    unset MILL_VERSION_TAG
+  fi
+
+  if [ "$MILL_TEST_DRY_RUN_LAUNCHER_SCRIPT" = "1" ] ; then
+    echo $DOWNLOAD_URL
+    echo $MILL
+    exit 0
+  fi
+  # TODO: handle command not found
+  echo "Downloading mill ${MILL_VERSION} from ${DOWNLOAD_URL} ..." 1>&2
+  ${CURL_CMD} -f -L -o "${DOWNLOAD_FILE}" "${DOWNLOAD_URL}"
+  chmod +x "${DOWNLOAD_FILE}"
+  mkdir -p "${MILL_DOWNLOAD_PATH}"
+  mv "${DOWNLOAD_FILE}" "${MILL}"
+
+  unset DOWNLOAD_FILE
+  unset DOWNLOAD_SUFFIX
+fi
+
+if [ -z "$MILL_MAIN_CLI" ] ; then
+  MILL_MAIN_CLI="${0}"
+fi
+
+MILL_FIRST_ARG=""
+if [ "$1" = "--bsp" ] || [ "${1#"-i"}" != "$1" ] || [ "$1" = "--interactive" ] || [ "$1" = "--no-server" ] || [ "$1" = "--no-daemon" ] || [ "$1" = "--repl" ] || [ "$1" = "--help" ] ; then
+  # Need to preserve the first position of those listed options
+  MILL_FIRST_ARG=$1
+  shift
+fi
+
+unset MILL_DOWNLOAD_PATH
+unset MILL_OLD_DOWNLOAD_PATH
+unset OLD_MILL
+unset MILL_VERSION
+unset MILL_REPO_URL
+
+# -D mill.main.cli is for compatibility with Mill 0.10.9 - 0.13.0-M2
+# We don't quote MILL_FIRST_ARG on purpose, so we can expand the empty value without quotes
+# shellcheck disable=SC2086
+exec "${MILL}" $MILL_FIRST_ARG -D "mill.main.cli=${MILL_MAIN_CLI}" "$@"