diff --git a/.mill-version b/.mill-version
index b80f98e6..e392c3dc 100644
--- a/.mill-version
+++ b/.mill-version
@@ -1 +1 @@
-0.11.7
+0.12.17
diff --git a/build.sc b/build.mill
similarity index 60%
rename from build.sc
rename to build.mill
index f454f795..bf472f18 100644
--- a/build.sc
+++ b/build.mill
@@ -1,10 +1,14 @@
-import mill._, scalalib._
-import coursier.maven.MavenRepository
+package build
+
+import mill._
+import mill.scalalib._
+
+val pwd = os.Path(sys.env("MILL_WORKSPACE_ROOT"))
 
 object ivys {
   val scala = "2.13.14"
-  val chisel = ivy"org.chipsalliance::chisel:7.11.0"
-  val chiselPlugin = ivy"org.chipsalliance:::chisel-plugin:7.11.0"
+  val chisel = mvn"org.chipsalliance::chisel:7.11.0"
+  val chiselPlugin = mvn"org.chipsalliance:::chisel-plugin:7.11.0"
 }
 
 trait CommonModule extends ScalaModule {
@@ -21,17 +25,15 @@ trait HasChisel extends ScalaModule {
 trait CommonNS extends SbtModule with CommonModule with HasChisel
 
 object difftest extends CommonNS {
-  override def millSourcePath = os.pwd / "difftest"
+  override def millSourcePath = pwd / "difftest"
 }
 
 object generator extends CommonNS {
-
-  override def millSourcePath = os.pwd
+  override def millSourcePath = pwd
 
   override def moduleDeps = super.moduleDeps ++ Seq(
     difftest
   )
 
-  object test extends SbtModuleTests with TestModule.ScalaTest
-
+  object test extends SbtTests with TestModule.ScalaTest
 }