Downgrade scala-xml to 2.13

build.sbt

@@ -459,7 +459,7 @@ lazy val testingProj = (project in file("testing"))
     baseSettings,
     name := "Testing",
     libraryDependencies ++= Seq(
-      scalaXml.value,
+      scalaXml.value.cross(CrossVersion.for3Use2_13),
       testInterface,
       launcherInterface,
       sjsonNewScalaJson.value,
@@ -923,7 +923,7 @@ lazy val mainProj = (project in file("main"))
     },
     libraryDependencies ++=
       (Seq(
-        scalaXml.value,
+        scalaXml.value.cross(CrossVersion.for3Use2_13),
         sjsonNewScalaJson.value,
         sjsonNewCore.value,
         launcherInterface,
@@ -1040,7 +1040,7 @@ lazy val sbtClientProj = (project in file("client"))
     crossPaths := false,
     exportJars := true,
     libraryDependencies += jansi,
-    libraryDependencies += scalatest % Test,
+    libraryDependencies += (scalatest % Test).cross(CrossVersion.for3Use2_13),
     Compile / mainClass := Some("sbt.client.Client"),
     nativeImageReady := { () =>
       ()

project/Dependencies.scala

@@ -15,8 +15,8 @@ object Dependencies {
   // sbt modules
   private val ioVersion = nightlyVersion.getOrElse("1.8.0")
   private val lmVersion =
-    sys.props.get("sbt.build.lm.version").orElse(nightlyVersion).getOrElse("2.0.0-alpha7")
-  val zincVersion = nightlyVersion.getOrElse("2.0.0-alpha6")
+    sys.props.get("sbt.build.lm.version").orElse(nightlyVersion).getOrElse("2.0.0-alpha8")
+  val zincVersion = nightlyVersion.getOrElse("2.0.0-alpha7")
 
   private val sbtIO = "org.scala-sbt" %% "io" % ioVersion
 
@@ -80,7 +80,7 @@ object Dependencies {
   def addSbtZincCompileCore = addSbtModule(sbtZincPath, "zincCompileCore", zincCompileCore)
 
   // val lmCoursierShaded = "io.get-coursier" %% "lm-coursier-shaded" % "2.0.10"
-  val lmCoursierShaded = "org.scala-sbt" %% "librarymanagement-coursier" % "2.0.0-alpha2"
+  val lmCoursierShaded = "org.scala-sbt" %% "librarymanagement-coursier" % "2.0.0-alpha3"
 
   lazy val sjsonNewVersion = "0.13.0"
   def sjsonNew(n: String) = Def.setting(

project/NightlyPlugin.scala

@@ -14,7 +14,7 @@ object NightlyPlugin extends AutoPlugin {
         Seq(
           scalacheck % Test,
           junit % Test,
-          scalatest % Test,
+          (scalatest % Test).cross(CrossVersion.for3Use2_13),
           scalaVerify % Test,
           hedgehog % Test
         )