diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index a47b1d17f..ce8debbc8 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -32,7 +32,7 @@ jobs:
           ./mill -i '__['"$SV"'].publishLocal'
         done
         ./mill -i __.publishLocal
-        ./mill -i ci.publishSonatype __.publishArtifacts
+        ./mill -i ci.publishSonatype --tasks __.publishArtifacts
       shell: bash
       env:
         PGP_PASSWORD: ${{ secrets.PUBLISH_SECRET_KEY_PASSWORD }}
diff --git a/.mill-version b/.mill-version
index 12edb292a..aac2dacab 100644
--- a/.mill-version
+++ b/.mill-version
@@ -1 +1 @@
-0.11.7
\ No newline at end of file
+0.12.1
\ No newline at end of file
diff --git a/build.sc b/build.sc
index 56814a740..a27a2069f 100644
--- a/build.sc
+++ b/build.sc
@@ -468,7 +468,7 @@ trait Examples extends SbtModule {
   private def examplesScalaVersion = "2.12.19"
   private def baseRepoRoot         = os.sub / "out" / "repo"
   def scalaVersion                 = ScalaVersions.scala3Latest
-  object test extends SbtModuleTests {
+  object test extends SbtTests {
     def testFramework = "munit.Framework"
     def ivyDeps = T {
       super.ivyDeps() ++ Agg(
@@ -570,7 +570,7 @@ trait Integration extends SbtModule {
     Deps.testUtil
   )
 
-  object test extends SbtModuleTests with TestCommand {
+  object test extends SbtTests with TestCommand {
     object helper extends ScalaModule {
       def scalaVersion = ScalaVersions.scala3Latest
       def scala213 = T {
diff --git a/docs/pages/dev-from-sources.md b/docs/pages/dev-from-sources.md
index 747946639..d94ecee44 100644
--- a/docs/pages/dev-from-sources.md
+++ b/docs/pages/dev-from-sources.md
@@ -63,7 +63,7 @@ Once done building, this should print the path to the kernel launcher, like
 
 Optionally, pass a Scala version, like
 ```text
-$ ./mill dev.launcherFast 2.12.13
+$ ./mill dev.launcherFast --scalaVersion 2.12.13
 ```
 
 You can then run that launcher to install it on your system:
diff --git a/project/deps.sc b/project/deps.sc
index 2abf1f91a..cc751b2aa 100644
--- a/project/deps.sc
+++ b/project/deps.sc
@@ -2,7 +2,7 @@ import mill._
 import mill.scalalib._
 
 object Versions {
-  def ammonite      = "3.0.0-M2-30-486378af"
+  def ammonite      = "3.0.0-2-6342755f"
   def caseApp       = "2.1.0-M26"
   def coursier      = "2.1.14"
   def jsoniterScala = "2.13.5"
diff --git a/project/settings.sc b/project/settings.sc
index 077cf3969..e71cc2ac4 100644
--- a/project/settings.sc
+++ b/project/settings.sc
@@ -47,7 +47,7 @@ trait CrossSbtModule extends mill.scalalib.SbtModule with mill.scalalib.CrossMod
       PathRef(millSourcePath / "src" / "main" / s"scala-$s")
     )
   }
-  trait CrossSbtModuleTests extends SbtModuleTests {
+  trait CrossSbtModuleTests extends SbtTests {
     override def millSourcePath = outer.millSourcePath
     def sources = T.sources {
       super.sources() ++ scalaVersionDirectoryNames.map(s =>
@@ -275,7 +275,7 @@ trait AlmondTestModule
         sysProps = props,
         outputPath = outputPath,
         colored = T.log.colored,
-        testCp = compile().classes.path,
+        testCp = Seq(compile().classes.path),
         home = T.home,
         globSelectors = globSelectors()
       )
@@ -808,7 +808,7 @@ trait TestCommand extends TestModule {
         sysProps = props,
         outputPath = outputPath,
         colored = T.log.colored,
-        testCp = compile().classes.path,
+        testCp = Seq(compile().classes.path),
         home = T.home,
         globSelectors = globSelectors
       )