diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 615035a..5893a72 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -19,5 +19,8 @@ jobs:
       with:
         distribution: temurin
         java-version: ${{ matrix.java }}
+    - uses: jodersky/setup-mill@v0.3.0
+      with:
+        mill-version: 0.11.2
     - name: Build and Test
-      run: sbt -v +test
+      run: mill test
diff --git a/.gitignore b/.gitignore
index 9e79245..09768f0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,3 +30,9 @@ metals.sbt
 .idea
 .idea_modules
 /.worksheet/
+
+# Mill
+out/
+
+# Emacs
+*.~undo-tree~
diff --git a/build.sbt b/build.sbt
deleted file mode 100644
index 6ae5011..0000000
--- a/build.sbt
+++ /dev/null
@@ -1,12 +0,0 @@
-val scala3Version = "3.2.0"
-
-lazy val root = project
-  .in(file("."))
-  .settings(
-    name := "qw.scala",
-    version := "0.1.0-SNAPSHOT",
-
-    scalaVersion := scala3Version,
-
-    libraryDependencies += "org.scalameta" %% "munit" % "0.7.29" % Test
-  )
diff --git a/build.sc b/build.sc
new file mode 100644
index 0000000..237d926
--- /dev/null
+++ b/build.sc
@@ -0,0 +1,9 @@
+import mill._, scalalib._
+
+object qw extends RootModule with ScalaModule {
+  def scalaVersion = "3.3.0"
+  def publishVersion = "0.1.1-SNAPSHOT"
+  object test extends ScalaTests with TestModule.Munit {
+    def ivyDeps = Agg(ivy"org.scalameta::munit::0.7.29")
+  }
+}
diff --git a/src/test/scala/com/github/windymelt/qw/SyntaxSuite.scala b/test/src/scala/com/github/windymelt/qw/SyntaxSuite.scala
similarity index 100%
rename from src/test/scala/com/github/windymelt/qw/SyntaxSuite.scala
rename to test/src/scala/com/github/windymelt/qw/SyntaxSuite.scala