diff --git a/main/src/main/scala/sbt/Defaults.scala b/main/src/main/scala/sbt/Defaults.scala
index 916219908..f4f96f1f5 100644
--- a/main/src/main/scala/sbt/Defaults.scala
+++ b/main/src/main/scala/sbt/Defaults.scala
@@ -1182,12 +1182,7 @@ object Defaults extends BuildCommon {
     val allJars = libraryJars ++ compilerJars ++ docJars
 
     val libraryLoader = classLoaderCache(libraryJars.toList, jansiExclusionLoader)
-    val compilerLoader = classLoaderCache(
-      // It should be `compilerJars` but it would break on `3.0.0-M2` because of
-      // https://github.com/lampepfl/dotty/blob/d932af954ef187d7bdb87500d49ed0ff530bd1e7/sbt-bridge/src/xsbt/CompilerClassLoader.java#L108-L117
-      allCompilerJars.toList,
-      libraryLoader
-    )
+    val compilerLoader = classLoaderCache(compilerJars.toList, libraryLoader)
     val fullLoader =
       if (docJars.isEmpty) compilerLoader
       else classLoaderCache(docJars.distinct.toList, compilerLoader)
diff --git a/sbt-app/src/sbt-test/compiler-project/scala3-tasty-management/build.sbt b/sbt-app/src/sbt-test/compiler-project/scala3-tasty-management/build.sbt
index 8796ff21b..538540498 100644
--- a/sbt-app/src/sbt-test/compiler-project/scala3-tasty-management/build.sbt
+++ b/sbt-app/src/sbt-test/compiler-project/scala3-tasty-management/build.sbt
@@ -1,6 +1,6 @@
 import xsbti.compile.TastyFiles
 
-ThisBuild / scalaVersion := "3.0.0-M2"
+ThisBuild / scalaVersion := "3.0.0-M3"
 
 TaskKey[Unit]("check") := {
   assert((Compile / auxiliaryClassFiles).value == Seq(TastyFiles.instance))
diff --git a/sbt-app/src/sbt-test/compiler-project/scala3-tasty-management/test b/sbt-app/src/sbt-test/compiler-project/scala3-tasty-management/test
index 52f74a532..e709a96dd 100644
--- a/sbt-app/src/sbt-test/compiler-project/scala3-tasty-management/test
+++ b/sbt-app/src/sbt-test/compiler-project/scala3-tasty-management/test
@@ -1,12 +1,12 @@
 > check
 > compile
 
-$ exists target/scala-3.0.0-M2/classes/A.tasty
-$ exists target/scala-3.0.0-M2/classes/B.tasty
+$ exists target/scala-3.0.0-M3/classes/A.tasty
+$ exists target/scala-3.0.0-M3/classes/B.tasty
 
 $ delete src/main/scala/B.scala
 
 > compile
 
-$ exists target/scala-3.0.0-M2/classes/A.tasty
--$ exists target/scala-3.0.0-M2/classes/B.tasty
+$ exists target/scala-3.0.0-M3/classes/A.tasty
+-$ exists target/scala-3.0.0-M3/classes/B.tasty
diff --git a/sbt-app/src/sbt-test/dependency-management/scala3-compiler-bridge-binary/build.sbt b/sbt-app/src/sbt-test/dependency-management/scala3-compiler-bridge-binary/build.sbt
index 998afcca4..ef00fcef5 100644
--- a/sbt-app/src/sbt-test/dependency-management/scala3-compiler-bridge-binary/build.sbt
+++ b/sbt-app/src/sbt-test/dependency-management/scala3-compiler-bridge-binary/build.sbt
@@ -1,4 +1,4 @@
-ThisBuild / scalaVersion := "3.0.0-M2"
+ThisBuild / scalaVersion := "3.0.0-M3"
 
 lazy val check = taskKey[Unit]("")
 
diff --git a/sbt-app/src/sbt-test/project/scala3-sandwich-sjs/build.sbt b/sbt-app/src/sbt-test/project/scala3-sandwich-sjs/build.sbt
index 01e81e167..661ac82a1 100644
--- a/sbt-app/src/sbt-test/project/scala3-sandwich-sjs/build.sbt
+++ b/sbt-app/src/sbt-test/project/scala3-sandwich-sjs/build.sbt
@@ -1,15 +1,15 @@
-ThisBuild / scalaVersion := "2.13.4"
+ThisBuild / scalaVersion := "2.13.6"
 ThisBuild / scalacOptions += "-Ytasty-reader"
 
 lazy val scala3code = project
   .enablePlugins(ScalaJSPlugin)
-  .settings(scalaVersion := "3.0.0-M1")
+  .settings(scalaVersion := "3.0.0")
 
 lazy val app = project
   .enablePlugins(ScalaJSPlugin)
   .dependsOn(scala3code)
   .settings(
-    scalaVersion := "2.13.4",
+    scalaVersion := "2.13.6",
     scalacOptions += "-Ytasty-reader",
     scalaJSUseMainModuleInitializer := true
   )
diff --git a/sbt-app/src/sbt-test/project/scala3-sandwich-sjs/project/plugins.sbt b/sbt-app/src/sbt-test/project/scala3-sandwich-sjs/project/plugins.sbt
index 8f1d0ac9b..56abd248d 100644
--- a/sbt-app/src/sbt-test/project/scala3-sandwich-sjs/project/plugins.sbt
+++ b/sbt-app/src/sbt-test/project/scala3-sandwich-sjs/project/plugins.sbt
@@ -1 +1 @@
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.3.1")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.6.0")
diff --git a/sbt-app/src/sbt-test/project/scala3-sandwich/build.sbt b/sbt-app/src/sbt-test/project/scala3-sandwich/build.sbt
index 69a2ca58f..75988d69d 100644
--- a/sbt-app/src/sbt-test/project/scala3-sandwich/build.sbt
+++ b/sbt-app/src/sbt-test/project/scala3-sandwich/build.sbt
@@ -1,6 +1,6 @@
-ThisBuild / scalaVersion := "3.0.0-M1"
+ThisBuild / scalaVersion := "3.0.0"
 
-lazy val scala213 = "2.13.4"
+lazy val scala213 = "2.13.6"
 
 lazy val root = (project in file("."))
   .aggregate(fooApp, fooCore, barApp, barCore)