diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 923a595..01a5355 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,49 +1,28 @@
 name: build
-
 on: [ push ]
-
 jobs:
-
   server:
     runs-on: ubuntu-latest
     steps:
-
-      - uses: actions/checkout@v1
-
-      - uses: actions/cache@v4
-        with:
-          path: ~/.cache/coursier/v1
-          key: ${{ runner.os }}-coursier-${{ hashFiles('**/build.sbt') }}
-
-      - name: Set up java
-        uses: actions/setup-java@v4
-        with:
-          distribution: 'temurin'
-          java-version: 21
-
-      - name: Set up sbt
-        uses: sbt/setup-sbt@v1
-
-      - name: Build
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: sbt server/stage
-
+      - uses: actions/checkout@v3
+      - name: Compile
+        run: ./mill __.compile
+      - name: Build distributable
+        run: ./mill server.assembly
       - name: Set up Docker Buildx
         id: buildx
         uses: docker/setup-buildx-action@master
-
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v1
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-
       - name: Push images
         uses: docker/build-push-action@v2
         with:
           context: .
+          file: Dockerfile
           platforms: linux/amd64,linux/arm64
           push: true
           tags: ghcr.io/torrentdam/server:${{ github.sha }}, ghcr.io/torrentdam/server:latest
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 3a2ca54..76de7c7 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -1,32 +1,21 @@
 name: release
-
 on:
   push:
     tags:
       - 'v*'
-
 jobs:
-
   release:
     if: startsWith(github.ref, 'refs/tags/v')
     runs-on: ubuntu-latest
     steps:
-
-      - uses: actions/checkout@v1
-
-      - name: Set up java
-        uses: actions/setup-java@v2.1.0
-        with:
-          distribution: adopt
-          java-version: 17
-          java-package: jre
-
-      - name: Publish
+      - uses: actions/checkout@v3
+      - name: Release
         env:
-          SONATYPE_CREDS: ${{ secrets.SONATYPE_CREDS }}
-          PGP_SECRET_KEY: ${{ secrets.PGP_SECRET_KEY }}
+          MILL_SONATYPE_USERNAME: ${{ secrets.MILL_SONATYPE_USERNAME }}
+          MILL_SONATYPE_PASSWORD: ${{ secrets.MILL_SONATYPE_PASSWORD }}
+          MILL_PGP_SECRET_BASE64: ${{ secrets.MILL_PGP_SECRET_BASE64 }}
+          MILL_PGP_PASSPHRASE: ${{ secrets.MILL_PGP_PASSPHRASE }}
         run: |
-          echo ${PGP_SECRET_KEY} | base64 --decode | gpg --import
-          export VERSION=${GITHUB_REF#*/v} 
+          export VERSION=${GITHUB_REF#*/v}
           echo Publishing $VERSION
-          sbt protocolJS/publishSigned
+          ./mill mill.javalib.SonatypeCentralPublishModule/
diff --git a/.gitignore b/.gitignore
index 48d0944..f5b03a5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,9 +1,7 @@
-target
+out
 .idea
 .idea_modules
 .metals
 .bloop
 .bsp
-.vscode
-node_modules
-package-lock.json
+logs
diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..6912837
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,23 @@
+# Build/Test Commands
+
+```bash
+# Compile all modules
+./mill __.compile
+
+# Run the server
+./mill server.run
+
+# Build executable server JAR
+./mill server.assembly
+
+# Format code with Scalafmt
+./mill mill.scalalib.scalafmt.ScalafmtModule/reformatAll __.sources
+```
+
+## Project Structure
+
+- **build.mill**: Mill build definition (primary)
+- **protocol/**: Protocol message types shared with the web client
+- **server/**: HTTP server entry point
+
+Each module has `src/main/scala/`
diff --git a/Dockerfile b/Dockerfile
index de5cf74..33749d3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,8 @@
 FROM eclipse-temurin:25-jre-noble
-
-COPY ./server/target/universal/stage /opt/bittorrent-server
-
-ENTRYPOINT ["/opt/bittorrent-server/bin/server", "-Dcats.effect.tracing.mode=none", "-J-XX:+UnlockExperimentalVMOptions", "-J-XX:+UseCompactObjectHeaders"]
+COPY ./out/server/assembly.dest/out.jar /opt/torrentdam/server.jar
+ENTRYPOINT ["java", \
+            "-Dcats.effect.tracing.mode=none", \
+            "-XX:+UnlockExperimentalVMOptions", \
+            "-XX:+UseCompactObjectHeaders", \
+            "-jar", \
+            "/opt/torrentdam/server.jar"]
diff --git a/build.mill b/build.mill
new file mode 100644
index 0000000..3301848
--- /dev/null
+++ b/build.mill
@@ -0,0 +1,85 @@
+//| mill-version: 1.1.8
+//| mill-jvm-version: temurin:21.0.6
+import mill.*, scalalib.*, publish.*
+
+object protocol extends CommonSettings {
+  def mvnDeps = Seq(
+    Deps.bittorrent.common,
+    Deps.upickle,
+    Deps.`scodec-bits`,
+  )
+}
+
+object server extends CommonSettings {
+  def moduleDeps = Seq(protocol)
+  def mvnDeps = Seq(
+    Deps.bittorrent.bittorrent,
+    Deps.bittorrent.dht,
+    Deps.`cats-effect`,
+    Deps.`fs2-io`,
+    Deps.http4s.core,
+    Deps.http4s.dsl,
+    Deps.http4s.server,
+    Deps.http4s.client,
+    Deps.`woof-core`,
+    Deps.`woof-slf4j`,
+    Deps.`cats-effect-cps`,
+  )
+}
+
+trait CommonSettings extends ScalaModule, PublishModule {
+  def scalaVersion = "3.8.3"
+  def scalacOptions = Seq(
+    "-source:future",
+    "-Xkind-projector:underscores",
+  )
+  def sources = Task.Sources(
+    moduleDir / "src" / "main" / "scala"
+  )
+  def resources = Task.Sources(
+    moduleDir / "src" / "main" / "resources"
+  )
+  def publishVersion = sys.env.getOrElse("VERSION", "SNAPSHOT")
+  def pomSettings = PomSettings(
+    description = "Bittorrent server protocol",
+    organization = "io.github.torrentdam.server",
+    url = "https://github.com/TorrentDam/server",
+    licenses = Seq(License.`Unlicense`),
+    versionControl = VersionControl.github("TorrentDam", "server"),
+    developers = Seq(
+      Developer("lavrov", "Vitaly Lavrov", "https://github.com/lavrov")
+    )
+  )
+}
+
+object Deps {
+  object Versions {
+    val bittorrent = "3.8.0"
+    val `cats-effect` = "3.6.0"
+    val fs2 = "3.12.2"
+    val `scodec-bits` = "1.2.4"
+    val upickle = "2.0.0"
+    val http4s = "1.0.0-M40"
+    val `cats-effect-cps` = "0.9.21"
+    val woof = "0.9.0"
+  }
+  object bittorrent {
+    private val org = "io.github.torrentdam.bittorrent"
+    val common = mvn"${org}::common::${Versions.bittorrent}"
+    val bittorrent = mvn"${org}::bittorrent::${Versions.bittorrent}"
+    val dht = mvn"${org}::dht::${Versions.bittorrent}"
+  }
+  val `cats-effect` = mvn"org.typelevel::cats-effect::${Versions.`cats-effect`}"
+  val `fs2-io` = mvn"co.fs2::fs2-io::${Versions.fs2}"
+  val `scodec-bits` = mvn"org.scodec::scodec-bits::${Versions.`scodec-bits`}"
+  val upickle = mvn"com.lihaoyi::upickle::${Versions.upickle}"
+  object http4s {
+    val core = mvn"org.http4s::http4s-core::${Versions.http4s}"
+    val dsl = mvn"org.http4s::http4s-dsl::${Versions.http4s}"
+    val server = mvn"org.http4s::http4s-ember-server::${Versions.http4s}"
+    val client = mvn"org.http4s::http4s-ember-client::${Versions.http4s}"
+  }
+  val `cats-effect-cps` = mvn"com.github.rssh::cps-async-connect-cats-effect::${Versions.`cats-effect-cps`}"
+  val `woof-core` = mvn"org.legogroup::woof-core::${Versions.woof}"
+  val `woof-slf4j` = mvn"org.legogroup::woof-slf4j::${Versions.woof}"
+}
diff --git a/build.sbt b/build.sbt
deleted file mode 100644
index 6106df6..0000000
--- a/build.sbt
+++ /dev/null
@@ -1,127 +0,0 @@
-import sbt.Keys.credentials
-
-lazy val root = project.in(file(".")).aggregate(server)
-
-lazy val protocol = crossProject(JSPlatform, JVMPlatform).crossType(CrossType.Pure)
-  .settings(commonSettings ++ publishSettings)
-  .settings(
-    description := "Bittorrent server protocol",
-    libraryDependencies ++= List(
-      Deps.bittorrent.common.value,
-      Deps.upickle.value,
-      Deps.`scodec-bits`.value,
-    )
-  )
-
-lazy val server = project
-  .dependsOn(protocol.jvm)
-  .settings(commonSettings)
-  .settings(
-    libraryDependencies ++= List(
-      Deps.bittorrent.bittorrent,
-      Deps.bittorrent.dht,
-      Deps.`cats-effect`,
-      Deps.`fs2-io`,
-      Deps.http4s.core,
-      Deps.http4s.dsl,
-      Deps.http4s.server,
-      Deps.http4s.client,
-      Deps.`woof-core`,
-      Deps.`woof-slf4j`,
-    ),
-  )
-  .enablePlugins(JavaAppPackaging)
-
-lazy val commonSettings: List[Setting[_]] = List(
-  organization := "io.github.torrentdam.server",
-  version := sys.env.getOrElse("VERSION", "SNAPSHOT"),
-  scalaVersion := "3.8.3",
-  scalacOptions ++= List(
-    "-source:future",
-    "-Xkind-projector:underscores",
-  ),
-  libraryDependencies ++= List(
-    Deps.`cps-async-cats-effect`,
-    Deps.`munit-cats-effect` % Test
-  )
-)
-
-lazy val publishSettings: List[Setting[_]] = List(
-  publishTo := {
-    val nexus = "https://s01.oss.sonatype.org/"
-    Some("releases" at nexus + "service/local/staging/deploy/maven2")
-  },
-  credentials ++= {
-    sys.env.get("SONATYPE_CREDS") match {
-      case Some(credentials) =>
-        val Array(username, password) = credentials.split(':')
-        List(
-          Credentials(
-            "Sonatype Nexus Repository Manager",
-            "s01.oss.sonatype.org",
-            username,
-            password
-          )
-        )
-      case None => List.empty[Credentials]
-    }
-  },
-  developers := List(
-    Developer(
-      id = "lavrov",
-      name = "Vitaly Lavrov",
-      email = "lavrovvv@gmail.com",
-      url = url("https://github.com/lavrov")
-    )
-  ),
-  scmInfo := Some(
-    ScmInfo(
-      url("https://github.com/TorrentDam/server"),
-      "scm:git@github.com:TorrentDam/server.git"
-    )
-  ),
-  licenses := List("Unlicense" -> url("https://unlicense.org/")),
-  homepage := Some(url("https://torrentdam.github.io/"))
-)
-
-lazy val Deps = new {
-
-  val bittorrent = new {
-    private val org = "io.github.torrentdam.bittorrent"
-    val common = Def.setting { org %%% "common" % Versions.bittorrent }
-    val bittorrent = org %% "bittorrent" % Versions.bittorrent
-    val dht = org %% "dht" % Versions.bittorrent
-  }
-
-  val `scodec-bits` = Def.setting {"org.scodec" %%% "scodec-bits" % Versions.`scodec-bits` }
-
-  val `cats-effect` = "org.typelevel" %% "cats-effect" % Versions.`cats-effect`
-  val `fs2-io` = "co.fs2" %% "fs2-io" % Versions.fs2
-
-  val http4s = new {
-    val core = "org.http4s" %% "http4s-core" % Versions.http4s
-    val dsl = "org.http4s" %% "http4s-dsl" % Versions.http4s
-    val server = "org.http4s" %% "http4s-ember-server" % Versions.http4s
-    val client = "org.http4s" %% "http4s-ember-client" % Versions.http4s
-  }
-
-  val `woof-core` = "org.legogroup" %% "woof-core"  % Versions.woof
-  val `woof-slf4j` = "org.legogroup" %% "woof-slf4j"  % Versions.woof
-
-  val upickle = Def.setting {"com.lihaoyi" %%% "upickle" % Versions.upickle }
-
-  val `munit-cats-effect` = "org.typelevel" %% "munit-cats-effect-3"  % "1.0.7"
-
-  val `cps-async-cats-effect` = "com.github.rssh" %% "cps-async-connect-cats-effect" % Versions.`cps-async`
-}
-
-lazy val Versions = new {
-  val bittorrent = "3.8.0"
-  val `cats-effect` = "3.6.0"
-  val fs2 = "3.12.2"
-  val `scodec-bits` = "1.2.4"
-  val upickle = "2.0.0"
-  val http4s = "1.0.0-M40"
-  val `cps-async` = "0.9.21"
-  val woof = "0.9.0"
-}
diff --git a/mill b/mill
new file mode 100755
index 0000000..8475523
--- /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=1.0.1
+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}" "$@"
diff --git a/project/build.properties b/project/build.properties
deleted file mode 100644
index ee4c672..0000000
--- a/project/build.properties
+++ /dev/null
@@ -1 +0,0 @@
-sbt.version=1.10.1
diff --git a/project/plugins.sbt b/project/plugins.sbt
deleted file mode 100644
index 5ff8e92..0000000
--- a/project/plugins.sbt
+++ /dev/null
@@ -1,4 +0,0 @@
-addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.1.0")
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.8.0")
-addSbtPlugin("com.github.sbt" % "sbt-native-packager" % "1.9.9")
-addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.1.2")