diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fc379ff0a..79d1fc023 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -32,10 +32,10 @@ jobs:
             java: 21
             distribution: temurin
             jobtype: 5
-          - os: ubuntu-latest
-            java: 8
-            distribution: zulu
-            jobtype: 6
+          # - os: ubuntu-latest
+          #   java: 8
+          #   distribution: zulu
+          #   jobtype: 6
           - os: ubuntu-latest
             java: 8
             distribution: zulu
diff --git a/.github/workflows/cla.yml b/.github/workflows/cla.yml
index 91f51361e..c7ec83e66 100644
--- a/.github/workflows/cla.yml
+++ b/.github/workflows/cla.yml
@@ -4,21 +4,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
-    - name: Check CLA
-      env:
-        AUTHOR: ${{ github.event.pull_request.user.login }}
-      run: |
-        echo "Pull request submitted by $AUTHOR";
-        signed=$(curl -s "https://contribute.akka.io/contribute/cla/scala/check/$AUTHOR" | jq -r ".signed");
-        if [ "$signed" = "true" ] ; then
-          echo "CLA check for $AUTHOR successful";
-        else
-          echo "CLA check for $AUTHOR failed";
-          echo "Please sign the Scala CLA to contribute to the Scala compiler.";
-          echo "Go to https://contribute.akka.io/contribute/cla/scala and then";
-          echo "comment on the pull request to ask for a new check.";
-          echo "";
-          echo "Check if CLA is signed: https://contribute.akka.io/contribute/cla/scala/check/$AUTHOR";
-          exit 1;
-        fi;
+      - name: Check CLA
+        uses: scala/cla-checker@v1
+        with:
+          author: ${{ github.event.pull_request.user.login }}
diff --git a/internal/util-core/src/main/scala/sbt/internal/util/Util.scala b/internal/util-core/src/main/scala/sbt/internal/util/Util.scala
index 76647737b..fd35934e0 100644
--- a/internal/util-core/src/main/scala/sbt/internal/util/Util.scala
+++ b/internal/util-core/src/main/scala/sbt/internal/util/Util.scala
@@ -12,6 +12,8 @@ import java.nio.file.{ Path, Paths }
 import java.util.Locale
 
 import scala.collection.concurrent.TrieMap
+import scala.reflect.Selectable.reflectiveSelectable
+import scala.util.control.NonFatal
 
 object Util:
   def makeList[T](size: Int, value: T): List[T] = List.fill(size)(value)
@@ -86,4 +88,46 @@ object Util:
       case None =>
         if sys.props("java.home").endsWith("jre") then Paths.get(sys.props("java.home")).getParent()
         else Paths.get(sys.props("java.home"))
+
+  /**
+   * Given a list of event handlers expressed partial functions, combine them
+   * together using orElse from the left.
+   */
+  def reduceIntents[A1, A2](intents: PartialFunction[A1, A2]*): PartialFunction[A1, A2] =
+    intents.toList.reduceLeft(_ orElse _)
+
+  lazy val majorJavaVersion: Int =
+    try {
+      val javaVersion = sys.props.get("java.version").getOrElse("1.0")
+      if (javaVersion.startsWith("1.")) {
+        javaVersion.split("\\.")(1).toInt
+      } else {
+        javaVersion.split("\\.")(0).toInt
+      }
+    } catch {
+      case NonFatal(_) => 0
+    }
+
+  private type GetId = {
+    def getId: Long
+  }
+  private type ThreadId = {
+    def threadId: Long
+  }
+
+  /**
+   * Returns current thread id.
+   * Thread.threadId was added in JDK 19, and deprecated Thread#getId
+   * https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/Thread.html#threadId()
+   */
+  def threadId: Long =
+    if (majorJavaVersion < 19) {
+      (Thread.currentThread(): AnyRef) match {
+        case g: GetId @unchecked => g.getId
+      }
+    } else {
+      (Thread.currentThread(): AnyRef) match {
+        case g: ThreadId @unchecked => g.threadId
+      }
+    }
 end Util
diff --git a/internal/util-position/src/main/scala-2/sbt/internal/util/SourcePositionMacro.scala b/internal/util-position/src/main/scala-2/sbt/internal/util/SourcePositionMacro.scala
index ad1a9401b..155e67ce7 100644
--- a/internal/util-position/src/main/scala-2/sbt/internal/util/SourcePositionMacro.scala
+++ b/internal/util-position/src/main/scala-2/sbt/internal/util/SourcePositionMacro.scala
@@ -22,7 +22,7 @@ abstract class SourcePositionImpl {
 }
 
 final class SourcePositionMacro(val c: blackbox.Context) {
-  import c.universe.{ NoPosition => _, _ }
+  import c.universe.{ NoPosition as _, * }
 
   def fromEnclosingImpl(): Expr[SourcePosition] = {
     val pos = c.enclosingPosition
diff --git a/internal/util-scripted/src/main/scala/sbt/internal/scripted/FileCommands.scala b/internal/util-scripted/src/main/scala/sbt/internal/scripted/FileCommands.scala
index 9f746ff9e..f20a362f4 100644
--- a/internal/util-scripted/src/main/scala/sbt/internal/scripted/FileCommands.scala
+++ b/internal/util-scripted/src/main/scala/sbt/internal/scripted/FileCommands.scala
@@ -56,6 +56,10 @@ class FileCommands(baseDirectory: File) extends BasicStatementHandler {
   def fromStrings(paths: List[String]) = paths.map(fromString)
   def fromString(path: String) = new File(baseDirectory, path)
   def filterFromStrings(exprs: List[String]): List[PathFilter] =
+    def globs(exprs: List[String]): List[PathFilter] =
+      exprs.map: g =>
+        if g.startsWith("/") then (Glob(g): PathFilter)
+        else (Glob(baseDirectory, g): PathFilter)
     def orGlobs =
       val exprs1 = exprs
         .mkString("")
@@ -63,16 +67,16 @@ class FileCommands(baseDirectory: File) extends BasicStatementHandler {
         .filter(_ != OR)
         .toList
         .map(_.trim)
-      val combined = exprs1.map(Glob(baseDirectory, _)) match
+      val combined = globs(exprs1) match
         case Nil      => sys.error("unexpected Nil")
-        case g :: Nil => (g: PathFilter)
+        case g :: Nil => g
         case g :: gs =>
-          gs.foldLeft(g: PathFilter) { case (acc, g) =>
-            acc || (g: PathFilter)
+          gs.foldLeft(g) { case (acc, g) =>
+            acc || g
           }
       List(combined)
     if exprs.contains("||") then orGlobs
-    else exprs.map(Glob(baseDirectory, _): PathFilter)
+    else globs(exprs)
 
   def touch(paths: List[String]): Unit = IO.touch(fromStrings(paths))
   def delete(paths: List[String]): Unit =
@@ -130,10 +134,10 @@ class FileCommands(baseDirectory: File) extends BasicStatementHandler {
     }
   }
 
-  private type NamedCommand = (String, List[String] => Unit)
+  type NamedCommand = (String, List[String] => Unit)
 
   // these are for readability of the command list
-  extension (commandName: String) {
+  extension (commandName: String)
     def nonEmpty(action: List[String] => Unit): NamedCommand =
       commandName -> { paths =>
         if (paths.isEmpty)
@@ -177,5 +181,4 @@ class FileCommands(baseDirectory: File) extends BasicStatementHandler {
         "Wrong number of arguments to " + commandName + " command.  " +
           requiredArgs + " required, found: '" + spaced(args) + "'."
       )
-  }
 }
diff --git a/launcher-package/integration-test/src/test/scala/RunnerTest.scala b/launcher-package/integration-test/src/test/scala/RunnerTest.scala
index f3d406502..382b259d7 100755
--- a/launcher-package/integration-test/src/test/scala/RunnerTest.scala
+++ b/launcher-package/integration-test/src/test/scala/RunnerTest.scala
@@ -4,6 +4,7 @@ import minitest._
 import scala.sys.process._
 import java.io.File
 import java.util.Locale
+import sbt.io.IO
 
 object SbtRunnerTest extends SimpleTestSuite with PowerAssertions {
   // 1.3.0, 1.3.0-M4
@@ -20,6 +21,10 @@ object SbtRunnerTest extends SimpleTestSuite with PowerAssertions {
     sbt.internal.Process(Seq(sbtScript.getAbsolutePath) ++ args, new File("citest"),
       "JAVA_OPTS" -> javaOpts,
       "SBT_OPTS" -> sbtOpts)
+  def sbtProcessInDir(dir: File)(args: String*) =
+    sbt.internal.Process(Seq(sbtScript.getAbsolutePath) ++ args, dir,
+      "JAVA_OPTS" -> "",
+      "SBT_OPTS" -> "")
 
   test("sbt runs") {
     assert(sbtScript.exists)
@@ -68,6 +73,27 @@ object SbtRunnerTest extends SimpleTestSuite with PowerAssertions {
     }
   }
 
+  test("sbt in empty directory") {
+    IO.withTemporaryDirectory { tmp =>
+      val out = sbtProcessInDir(tmp)("about").!
+      assert(out == 1)
+    }
+    IO.withTemporaryDirectory { tmp =>
+      val out = sbtProcessInDir(tmp)("about", "--allow-empty").!
+      assert(out == 0)
+    }
+    ()
+  }
+
+  test("sbt --script-version in empty directory") {
+    IO.withTemporaryDirectory { tmp =>
+      val out = sbtProcessInDir(tmp)("--script-version").!!.trim
+      val expectedVersion = "^"+versionRegEx+"$"
+      assert(out.matches(expectedVersion))
+    }
+    ()
+  }
+
   /*
   test("sbt --client") {
     val out = sbtProcess("--client", "--no-colors", "compile").!!.linesIterator.toList
diff --git a/launcher-package/src/universal/bin/sbt.bat b/launcher-package/src/universal/bin/sbt.bat
index 093e27323..60fffe404 100755
--- a/launcher-package/src/universal/bin/sbt.bat
+++ b/launcher-package/src/universal/bin/sbt.bat
@@ -45,7 +45,7 @@ set sbt_args_timings=
 set sbt_args_traces=
 set sbt_args_sbt_boot=
 set sbt_args_sbt_cache=
-set sbt_args_sbt_create=
+set sbt_args_allow_empty=
 set sbt_args_sbt_dir=
 set sbt_args_sbt_version=
 set sbt_args_mem=
@@ -72,11 +72,13 @@ rem TODO: remove/deprecate sbtconfig.txt and parse the sbtopts files
 rem FIRST we load the config file of extra options.
 set SBT_CONFIG=!SBT_HOME!\conf\sbtconfig.txt
 set SBT_CFG_OPTS=
-for /F "tokens=* eol=# usebackq delims=" %%i in ("!SBT_CONFIG!") do (
-  set DO_NOT_REUSE_ME=%%i
-  rem ZOMG (Part #2) WE use !! here to delay the expansion of
-  rem SBT_CFG_OPTS, otherwise it remains "" for this loop.
-  set SBT_CFG_OPTS=!SBT_CFG_OPTS! !DO_NOT_REUSE_ME!
+if exist "!SBT_CONFIG!" (
+  for /F "tokens=* eol=# usebackq delims=" %%i in ("!SBT_CONFIG!") do (
+    set DO_NOT_REUSE_ME=%%i
+    rem ZOMG (Part #2) WE use !! here to delay the expansion of
+    rem SBT_CFG_OPTS, otherwise it remains "" for this loop.
+    set SBT_CFG_OPTS=!SBT_CFG_OPTS! !DO_NOT_REUSE_ME!
+  )
 )
 
 rem poor man's jenv (which is not available on Windows)
@@ -235,12 +237,14 @@ if defined _traces_arg (
   goto args_loop
 )
 
-if "%~0" == "-sbt-create" set _sbt_create_arg=true
-if "%~0" == "--sbt-create" set _sbt_create_arg=true
+if "%~0" == "-sbt-create" set _allow_empty_arg=true
+if "%~0" == "--sbt-create" set _allow_empty_arg=true
+if "%~0" == "-allow-empty" set _allow_empty_arg=true
+if "%~0" == "--allow-empty" set _allow_empty_arg=true
 
-if defined _sbt_create_arg (
-  set _sbt_create_arg=
-  set sbt_args_sbt_create=1
+if defined _allow_empty_arg (
+  set _allow_empty_arg=
+  set sbt_args_allow_empty=1
   goto args_loop
 )
 
@@ -526,25 +530,12 @@ goto args_loop
 rem Confirm a user's intent if the current directory does not look like an sbt
 rem top-level directory and the "new" command was not given.
 
-if not defined sbt_args_sbt_create if not defined sbt_args_print_version if not defined sbt_args_print_sbt_version if not defined sbt_args_print_sbt_script_version if not defined shutdownall if not exist build.sbt (
+if not defined sbt_args_allow_empty if not defined sbt_args_print_version if not defined sbt_args_print_sbt_version if not defined sbt_args_print_sbt_script_version if not defined shutdownall if not exist build.sbt (
   if not exist project\ (
     if not defined sbt_new (
-      echo [warn] Neither build.sbt nor a 'project' directory in the current directory: "%CD%"
-      setlocal
-:confirm
-      echo c^) continue
-      echo q^) quit
-
-      set /P reply=^?
-      if /I "!reply!" == "c" (
-        goto confirm_end
-      ) else if /I "!reply!" == "q" (
-        exit /B 1
-      )
-
-      goto confirm
-:confirm_end
-      endlocal
+      echo [error] Neither build.sbt nor a 'project' directory in the current directory: "%CD%"
+      echo [error] run 'sbt new', touch build.sbt, or run 'sbt --allow-empty'.
+      goto error
     )
   )
 )
diff --git a/launcher-package/src/universal/conf/sbtopts b/launcher-package/src/universal/conf/sbtopts
index c6f4e7bec..5990223b7 100644
--- a/launcher-package/src/universal/conf/sbtopts
+++ b/launcher-package/src/universal/conf/sbtopts
@@ -9,7 +9,7 @@
 
 # Starts sbt even if the current directory contains no sbt project.
 #
--sbt-create
+#--allow-empty
 
 # Path to global settings/plugins directory (default: ~/.sbt)
 #
@@ -31,11 +31,11 @@
 #
 #-no-share
 
-# Put SBT in offline mode.
+# Put sbt in offline mode.
 #
 #-offline
 
-# Sets the SBT version to use.
+# Sets the sbt version to use.
 #-sbt-version  0.11.3
 
 # Scala version (default: latest release)
diff --git a/main-command/src/main/scala/sbt/internal/client/NetworkClient.scala b/main-command/src/main/scala/sbt/internal/client/NetworkClient.scala
index f9606d27a..3378df979 100644
--- a/main-command/src/main/scala/sbt/internal/client/NetworkClient.scala
+++ b/main-command/src/main/scala/sbt/internal/client/NetworkClient.scala
@@ -530,60 +530,76 @@ class NetworkClient(
         .getOrElse(1)
     case _ => 1
   }
-  private def completeExec(execId: String, exitCode: => Int): Unit =
+
+  private val onAttachResponse: PartialFunction[JsonRpcResponseMessage, Unit] = {
+    case msg if attachUUID.get == msg.id =>
+      attachUUID.set(null)
+      attached.set(true)
+      Option(inputThread.get).foreach(_.drain())
+      ()
+  }
+  def completeExec(execId: String, exitCode: Int) = {
     pendingResults.remove(execId) match {
-      case null =>
+      case null => ()
       case (q, startTime, name) =>
         val now = System.currentTimeMillis
         val message = NetworkClient.timing(startTime, now)
-        val ec = exitCode
         if (batchMode.get || !attached.get) {
-          if (ec == 0) console.success(message)
+          if (exitCode == 0) console.success(message)
           else console.appendLog(Level.Error, message)
         }
-        Util.ignoreResult(q.offer(ec))
-    }
-  def onResponse(msg: JsonRpcResponseMessage): Unit = {
-    completeExec(msg.id, getExitCode(msg.result))
-    pendingCancellations.remove(msg.id) match {
-      case null =>
-      case q    => q.offer(msg.toString.contains("Task cancelled"))
-    }
-    msg.id match {
-      case execId =>
-        if (attachUUID.get == msg.id) {
-          attachUUID.set(null)
-          attached.set(true)
-          Option(inputThread.get).foreach(_.drain())
-        }
-        pendingCompletions.remove(execId) match {
-          case null =>
-          case completions =>
-            completions(msg.result match {
-              case Some(o: JObject) =>
-                o.value
-                  .foldLeft(CompletionResponse(Vector.empty[String])) { case (resp, i) =>
-                    if (i.field == "items")
-                      resp.withItems(
-                        Converter
-                          .fromJson[Vector[String]](i.value)
-                          .getOrElse(Vector.empty[String])
-                      )
-                    else if (i.field == "cachedTestNames")
-                      resp.withCachedTestNames(
-                        Converter.fromJson[Boolean](i.value).getOrElse(true)
-                      )
-                    else if (i.field == "cachedMainClassNames")
-                      resp.withCachedMainClassNames(
-                        Converter.fromJson[Boolean](i.value).getOrElse(true)
-                      )
-                    else resp
-                  }
-              case _ => CompletionResponse(Vector.empty[String])
-            })
-        }
+        Util.ignoreResult(q.offer(exitCode))
     }
   }
+  private val onExecResponse: PartialFunction[JsonRpcResponseMessage, Unit] = {
+    case msg if pendingResults.containsKey(msg.id) =>
+      completeExec(msg.id, getExitCode(msg.result))
+  }
+  private val onCancellationResponse: PartialFunction[JsonRpcResponseMessage, Unit] = {
+    case msg if pendingCancellations.containsKey(msg.id) =>
+      pendingCancellations.remove(msg.id) match {
+        case null => ()
+        case q    => Util.ignoreResult(q.offer(msg.toString.contains("Task cancelled")))
+      }
+  }
+  private val onCompletionResponse: PartialFunction[JsonRpcResponseMessage, Unit] = {
+    case msg if pendingCompletions.containsKey(msg.id) =>
+      pendingCompletions.remove(msg.id) match {
+        case null => ()
+        case completions =>
+          completions(msg.result match {
+            case Some(o: JObject) =>
+              o.value
+                .foldLeft(CompletionResponse(Vector.empty[String])) { case (resp, i) =>
+                  if (i.field == "items")
+                    resp.withItems(
+                      Converter
+                        .fromJson[Vector[String]](i.value)
+                        .getOrElse(Vector.empty[String])
+                    )
+                  else if (i.field == "cachedTestNames")
+                    resp.withCachedTestNames(
+                      Converter.fromJson[Boolean](i.value).getOrElse(true)
+                    )
+                  else if (i.field == "cachedMainClassNames")
+                    resp.withCachedMainClassNames(
+                      Converter.fromJson[Boolean](i.value).getOrElse(true)
+                    )
+                  else resp
+                }
+            case _ => CompletionResponse(Vector.empty[String])
+          })
+      }
+  }
+  // cache the composed plan
+  private val responsePlan = Util.reduceIntents[JsonRpcResponseMessage, Unit](
+    onExecResponse,
+    onCancellationResponse,
+    onAttachResponse,
+    onCompletionResponse,
+    { case _ => () },
+  )
+  def onResponse(msg: JsonRpcResponseMessage): Unit = responsePlan(msg)
 
   def onNotification(msg: JsonRpcNotificationMessage): Unit = {
     def splitToMessage: Vector[(Level.Value, String)] =
diff --git a/main/src/main/scala/sbt/Defaults.scala b/main/src/main/scala/sbt/Defaults.scala
index fc2ed599e..a3f52b87c 100644
--- a/main/src/main/scala/sbt/Defaults.scala
+++ b/main/src/main/scala/sbt/Defaults.scala
@@ -191,6 +191,7 @@ object Defaults extends BuildCommon {
       apiMappings := Map.empty,
       autoScalaLibrary :== true,
       managedScalaInstance :== true,
+      allowUnsafeScalaLibUpgrade :== false,
       classpathEntryDefinesClass := { (file: File) =>
         sys.error("use classpathEntryDefinesClassVF instead")
       },
@@ -296,6 +297,7 @@ object Defaults extends BuildCommon {
       csrLogger := LMCoursier.coursierLoggerTask.value,
       csrMavenProfiles :== Set.empty,
       csrReconciliations :== LMCoursier.relaxedForAllModules,
+      csrMavenDependencyOverride :== false,
       csrSameVersions := Seq(
         ScalaArtifacts.Artifacts.map(a => InclExclRule(scalaOrganization.value, a)).toSet
       ),
diff --git a/main/src/main/scala/sbt/Keys.scala b/main/src/main/scala/sbt/Keys.scala
index 26ef3c1e5..1cf58ec50 100644
--- a/main/src/main/scala/sbt/Keys.scala
+++ b/main/src/main/scala/sbt/Keys.scala
@@ -499,6 +499,7 @@ object Keys {
   val csrPublications = taskKey[Seq[(lmcoursier.definitions.Configuration, lmcoursier.definitions.Publication)]]("")
   val csrReconciliations = settingKey[Seq[(ModuleMatchers, Reconciliation)]]("Strategy to reconcile version conflicts.")
   val csrSameVersions = settingKey[Seq[Set[InclExclRule]]]("Modules to keep at the same version.")
+  val csrMavenDependencyOverride = settingKey[Boolean]("Enables Maven dependency override (bill of materials) support")
 
   val internalConfigurationMap = settingKey[Configuration => Configuration]("Maps configurations to the actual configuration used to define the classpath.").withRank(CSetting)
   val classpathConfiguration = taskKey[Configuration]("The configuration used to define the classpath.").withRank(CTask)
@@ -615,6 +616,7 @@ object Keys {
   val conflictManager = settingKey[ConflictManager]("Selects the conflict manager to use for dependency management.").withRank(CSetting)
   val autoScalaLibrary = settingKey[Boolean]("Adds a dependency on scala-library if true.").withRank(ASetting)
   val managedScalaInstance = settingKey[Boolean]("Automatically obtains Scala tools as managed dependencies if true.").withRank(BSetting)
+  val allowUnsafeScalaLibUpgrade = settingKey[Boolean]("Allow the Scala library on the compilation classpath to be newer than the scalaVersion (see Scala SIP-51).").withRank(CSetting)
   val sbtResolver = settingKey[Resolver]("Provides a resolver for obtaining sbt as a dependency.").withRank(BMinusSetting)
   val sbtResolvers = settingKey[Seq[Resolver]]("The external resolvers for sbt and plugin dependencies.").withRank(BMinusSetting)
   val sbtDependency = settingKey[ModuleID]("Provides a definition for declaring the current version of sbt.").withRank(BMinusSetting)
diff --git a/main/src/main/scala/sbt/coursierint/LMCoursier.scala b/main/src/main/scala/sbt/coursierint/LMCoursier.scala
index 03fb2e43d..2631c142e 100644
--- a/main/src/main/scala/sbt/coursierint/LMCoursier.scala
+++ b/main/src/main/scala/sbt/coursierint/LMCoursier.scala
@@ -95,6 +95,7 @@ object LMCoursier {
       depsOverrides: Seq[ModuleID],
       updateConfig: Option[UpdateConfiguration],
       sameVersions: Seq[Set[InclExclRule]],
+      enableDependencyOverrides: Option[Boolean],
       log: Logger
   ): CoursierConfiguration = {
     val coursierExcludeDeps = Inputs
@@ -146,6 +147,7 @@ object LMCoursier {
       .withForceVersions(userForceVersions.toVector)
       .withMissingOk(missingOk)
       .withSameVersions(sameVersions)
+    // .withEnableDependencyOverrides(enableDependencyOverrides)
   }
 
   def coursierConfigurationTask: Def.Initialize[Task[CoursierConfiguration]] = Def.task {
@@ -172,6 +174,7 @@ object LMCoursier {
       dependencyOverrides.value,
       Some(updateConfiguration.value),
       csrSameVersions.value,
+      Some(csrMavenDependencyOverride.value),
       streams.value.log
     )
   }
@@ -207,6 +210,7 @@ object LMCoursier {
       dependencyOverrides.value,
       Some(updateConfiguration.value),
       csrSameVersions.value,
+      Some(csrMavenDependencyOverride.value),
       streams.value.log
     )
   }
@@ -235,6 +239,7 @@ object LMCoursier {
       dependencyOverrides.value,
       Some(updateConfiguration.value),
       csrSameVersions.value,
+      Some(csrMavenDependencyOverride.value),
       streams.value.log
     )
   }
diff --git a/main/src/main/scala/sbt/internal/AbstractTaskExecuteProgress.scala b/main/src/main/scala/sbt/internal/AbstractTaskExecuteProgress.scala
index fac7ccd7c..34c90aacd 100644
--- a/main/src/main/scala/sbt/internal/AbstractTaskExecuteProgress.scala
+++ b/main/src/main/scala/sbt/internal/AbstractTaskExecuteProgress.scala
@@ -9,6 +9,7 @@
 package sbt
 package internal
 
+import sbt.internal.util.Util
 import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.atomic.AtomicLong
 import scala.jdk.CollectionConverters.*
@@ -126,6 +127,7 @@ object AbstractTaskExecuteProgress {
   private[sbt] class Timer() {
     val startNanos: Long = System.nanoTime()
     val threadName: String = Thread.currentThread().getName
+    val threadId: Long = Util.threadId
     var endNanos: Long = 0L
     def stop(): Unit = {
       endNanos = System.nanoTime()
diff --git a/main/src/main/scala/sbt/internal/Compiler.scala b/main/src/main/scala/sbt/internal/Compiler.scala
index 9bd298c80..f306b4fec 100644
--- a/main/src/main/scala/sbt/internal/Compiler.scala
+++ b/main/src/main/scala/sbt/internal/Compiler.scala
@@ -70,6 +70,7 @@ object Compiler:
   def scalaInstanceFromUpdate: Def.Initialize[Task[ScalaInstance]] = Def.task {
     val sv = Keys.scalaVersion.value
     val fullReport = Keys.update.value
+    val s = Keys.streams.value
 
     // For Scala 3, update scala-library.jar in `scala-tool` and `scala-doc-tool` in case a newer version
     // is present in the `compile` configuration. This is needed once forwards binary compatibility is dropped
@@ -95,28 +96,39 @@ object Compiler:
         .getOrElse(sys.error(noToolConfiguration(Keys.managedScalaInstance.value)))
     )
 
-    if (Classpaths.isScala213(sv)) {
-      for {
-        compileReport <- fullReport.configuration(Configurations.Compile)
-        libName <- ScalaArtifacts.Artifacts
-      } {
-        for (lib <- compileReport.modules.find(_.module.name == libName)) {
-          val libVer = lib.module.revision
-          val n = Keys.name.value
-          if (VersionNumber(sv).matchesSemVer(SemanticSelector(s"<$libVer")))
-            sys.error(
-              s"""expected `$n/scalaVersion` to be "$libVer" or later,
-                 |but found "$sv"; upgrade scalaVersion to fix the build.
-                 |
-                 |to support backwards-only binary compatibility (SIP-51),
-                 |the Scala 2.13 compiler cannot be older than $libName on the
-                 |dependency classpath.
-                 |see `$n/evicted` to know why $libName $libVer is getting pulled in.
-                 |""".stripMargin
-            )
-        }
-      }
-    }
+    if Classpaths.isScala213(sv) then
+      val scalaDeps = for
+        compileReport <- fullReport.configuration(Configurations.Compile).iterator
+        libName <- ScalaArtifacts.Artifacts.iterator
+        lib <- compileReport.modules.find(_.module.name == libName)
+      yield lib
+      for lib <- scalaDeps.take(1) do
+        val libVer = lib.module.revision
+        val libName = lib.module.name
+        val n = Keys.name.value
+        if VersionNumber(sv).matchesSemVer(SemanticSelector(s"<$libVer")) then
+          val err = !Keys.allowUnsafeScalaLibUpgrade.value
+          val fix =
+            if err then
+              """Upgrade the `scalaVersion` to fix the build. If upgrading the Scala compiler version is
+                |not possible (for example due to a regression in the compiler or a missing dependency),
+                |this error can be demoted by setting `allowUnsafeScalaLibUpgrade := true`.""".stripMargin
+            else s"""Note that the dependency classpath and the runtime classpath of your project
+                 |contain the newer $libName $libVer, even if the scalaVersion is $sv.
+                 |Compilation (macro expansion) or using the Scala REPL in sbt may fail with a LinkageError.""".stripMargin
+          val msg =
+            s"""Expected `$n/scalaVersion` to be $libVer or later, but found $sv.
+               |To support backwards-only binary compatibility (SIP-51), the Scala 2.13 compiler
+               |should not be older than $libName on the dependency classpath.
+               |
+               |$fix
+               |
+               |See `$n/evicted` to know why $libName $libVer is getting pulled in.
+               |""".stripMargin
+          if err then sys.error(msg)
+          else s.log.warn(msg)
+        else ()
+    else ()
     def file(id: String): File = {
       val files = for {
         m <- toolReport.modules if m.module.name.startsWith(id)
diff --git a/main/src/main/scala/sbt/internal/CrossJava.scala b/main/src/main/scala/sbt/internal/CrossJava.scala
index 2914d8dbe..2f4f8769d 100644
--- a/main/src/main/scala/sbt/internal/CrossJava.scala
+++ b/main/src/main/scala/sbt/internal/CrossJava.scala
@@ -409,12 +409,18 @@ private[sbt] object CrossJava {
 
     class MacOsDiscoverConfig extends JavaDiscoverConf {
       val base: File = file("/Library") / "Java" / "JavaVirtualMachines"
+      // User-specific JDKs are installed, for example, by IntelliJ IDEA
+      private val baseInUserHome: File = Path.userHome / "Library" / "Java" / "JavaVirtualMachines"
 
       def javaHomes: Vector[(String, File)] =
-        wrapNull(base.list())
-          .collect { case dir @ JavaHomeDir(version) =>
-            version -> (base / dir / "Contents" / "Home")
-          }
+        findAllHomes(base) ++
+          findAllHomes(baseInUserHome)
+
+      private def findAllHomes(root: File): Vector[(String, File)] = {
+        wrapNull(root.list()).collect { case dir @ JavaHomeDir(version) =>
+          version -> (root / dir / "Contents" / "Home")
+        }
+      }
     }
 
     class JabbaDiscoverConfig extends JavaDiscoverConf {
diff --git a/main/src/main/scala/sbt/internal/LintUnused.scala b/main/src/main/scala/sbt/internal/LintUnused.scala
index 2ce9cf217..7f786e18d 100644
--- a/main/src/main/scala/sbt/internal/LintUnused.scala
+++ b/main/src/main/scala/sbt/internal/LintUnused.scala
@@ -34,6 +34,7 @@ object LintUnused {
       configuration,
       crossScalaVersions,
       crossSbtVersions,
+      allowUnsafeScalaLibUpgrade,
       evictionWarningOptions,
       initialize,
       lintUnusedKeysOnLoad,
diff --git a/main/src/main/scala/sbt/internal/TaskTraceEvent.scala b/main/src/main/scala/sbt/internal/TaskTraceEvent.scala
index 980966c02..ef591f939 100644
--- a/main/src/main/scala/sbt/internal/TaskTraceEvent.scala
+++ b/main/src/main/scala/sbt/internal/TaskTraceEvent.scala
@@ -59,7 +59,7 @@ private[sbt] final class TaskTraceEvent extends AbstractTaskExecuteProgress with
       def durationEvent(name: String, cat: String, t: Timer): String = {
         val sb = new java.lang.StringBuilder(name.length + 2)
         CompactPrinter.print(new JString(name), sb)
-        s"""{"name": ${sb.toString}, "cat": "$cat", "ph": "X", "ts": ${(t.startMicros)}, "dur": ${(t.durationMicros)}, "pid": 0, "tname": "${t.threadName}"}"""
+        s"""{"name": ${sb.toString}, "cat": "$cat", "ph": "X", "ts": ${(t.startMicros)}, "dur": ${(t.durationMicros)}, "pid": 0, "tid": "${t.threadId}"}"""
       }
       val entryIterator = currentTimings
       while (entryIterator.hasNext) {
diff --git a/main/src/main/scala/sbt/internal/server/BuildServerProtocol.scala b/main/src/main/scala/sbt/internal/server/BuildServerProtocol.scala
index 9ad019378..3bae49407 100644
--- a/main/src/main/scala/sbt/internal/server/BuildServerProtocol.scala
+++ b/main/src/main/scala/sbt/internal/server/BuildServerProtocol.scala
@@ -34,6 +34,7 @@ import sjsonnew.support.scalajson.unsafe.{ CompactPrinter, Converter, Parser as
 import xsbti.CompileFailed
 
 import java.io.File
+import java.nio.file.Paths
 import java.util.concurrent.atomic.AtomicBoolean
 import scala.collection.mutable
 
@@ -628,12 +629,18 @@ object BuildServerProtocol {
         val thisProjectRef = Keys.thisProjectRef.value
         val thisConfig = Keys.configuration.value
         val scalaJars = Keys.scalaInstance.value.allJars.map(_.toURI.toString)
+        val (javaHomeForTarget, isForkedJava) = Keys.javaHome.value match
+          case Some(forkedJava) => (Some(forkedJava.toURI), true)
+          case None => (sys.props.get("java.home").map(Paths.get(_)).map(_.toUri), false)
+        val javaVersionForTarget = extractJavaVersion(javacOptions.value, isForkedJava)
+        val jvmBuildTarget = JvmBuildTarget(javaHomeForTarget, javaVersionForTarget)
         val compileData = ScalaBuildTarget(
           scalaOrganization = scalaOrganization.value,
           scalaVersion = scalaVersion.value,
           scalaBinaryVersion = scalaBinaryVersion.value,
           platform = ScalaPlatform.JVM,
-          jars = scalaJars.toVector
+          jars = scalaJars.toVector,
+          jvmBuildTarget = jvmBuildTarget,
         )
         val configuration = Keys.configuration.value
         val displayName = BuildTargetName.fromScope(thisProject.id, configuration.name)
@@ -699,7 +706,11 @@ object BuildServerProtocol {
       scalaVersion = scalaProvider.version(),
       scalaBinaryVersion = binaryScalaVersion(scalaProvider.version()),
       platform = ScalaPlatform.JVM,
-      jars = scalaJars.toVector.map(_.toURI.toString)
+      jars = scalaJars.toVector.map(_.toURI.toString),
+      jvmBuildTarget = JvmBuildTarget(
+        sys.props.get("java.home").map(Paths.get(_)).map(_.toUri),
+        sys.props.get("java.version")
+      ),
     )
     val sbtVersionValue = sbtVersion.value
     val sbtData = SbtBuildTarget(
@@ -1057,6 +1068,26 @@ object BuildServerProtocol {
     )
   }
 
+  private def extractJavaVersion(
+      javacOptions: Seq[String],
+      isForkedJava: Boolean
+  ): Option[String] = {
+    def getVersionAfterFlag(flag: String): Option[String] = {
+      val index = javacOptions.indexOf(flag)
+      if (index >= 0) javacOptions.lift(index + 1)
+      else None
+    }
+
+    val versionFromJavacOption = getVersionAfterFlag("--release")
+      .orElse(getVersionAfterFlag("--target"))
+      .orElse(getVersionAfterFlag("-target"))
+
+    versionFromJavacOption.orElse {
+      // TODO: extract java version from forked javac
+      if (isForkedJava) None else sys.props.get("java.version")
+    }
+  }
+
   // naming convention still seems like the only reliable way to get IntelliJ to import this correctly
   // https://github.com/JetBrains/intellij-scala/blob/a54c2a7c157236f35957049cbfd8c10587c9e60c/scala/scala-impl/src/org/jetbrains/sbt/language/SbtFileImpl.scala#L82-L84
   private def toSbtTargetIdName(ref: LoadedBuildUnit): String = {
diff --git a/main/src/main/scala/sbt/internal/server/NetworkChannel.scala b/main/src/main/scala/sbt/internal/server/NetworkChannel.scala
index 9b4daf29d..0456b13e5 100644
--- a/main/src/main/scala/sbt/internal/server/NetworkChannel.scala
+++ b/main/src/main/scala/sbt/internal/server/NetworkChannel.scala
@@ -165,7 +165,7 @@ final class NetworkChannel(
       }
   }
 
-  val thread = new Thread(s"sbt-networkchannel-${connection.getPort}") {
+  private val thread = new Thread(s"sbt-networkchannel-${connection.getPort}") {
     private val ct = "Content-Type: "
     private val x1 = "application/sbt-x1"
     override def run(): Unit = {
@@ -243,7 +243,6 @@ final class NetworkChannel(
       }
     }
   }
-  thread.start()
 
   private[sbt] def isLanguageServerProtocol: Boolean = true
 
@@ -370,7 +369,6 @@ final class NetworkChannel(
     s"sbt-$name-write-thread"
   )
   writeThread.setDaemon(true)
-  writeThread.start()
 
   def publishBytes(event: Array[Byte], delimit: Boolean): Unit =
     try pendingWrites.put(event -> delimit)
@@ -959,6 +957,9 @@ final class NetworkChannel(
     }
   }
   private[sbt] def isAttached: Boolean = attached.get
+
+  thread.start()
+  writeThread.start()
 }
 
 object NetworkChannel {
diff --git a/main/src/main/scala/sbt/plugins/Giter8TemplatePlugin.scala b/main/src/main/scala/sbt/plugins/Giter8TemplatePlugin.scala
index 9d0a43d91..ac39d1a26 100644
--- a/main/src/main/scala/sbt/plugins/Giter8TemplatePlugin.scala
+++ b/main/src/main/scala/sbt/plugins/Giter8TemplatePlugin.scala
@@ -27,7 +27,7 @@ object Giter8TemplatePlugin extends AutoPlugin {
           ModuleID(
             "org.scala-sbt.sbt-giter8-resolver",
             "sbt-giter8-resolver",
-            "0.16.2"
+            "0.17.0"
           ).cross(CrossVersion.binary),
           "sbtgiter8resolver.Giter8TemplateResolver"
         )
diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index 42d7c94e9..c1ad8af9d 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -3,7 +3,7 @@ import Keys.*
 
 object Dependencies {
   // WARNING: Please Scala update versions in PluginCross.scala too
-  val scala213 = "2.13.15"
+  val scala213 = "2.13.16"
   val scala3 = "3.6.3"
   val checkPluginCross = settingKey[Unit]("Make sure scalaVersion match up")
   val baseScalaVersion = scala3
@@ -77,7 +77,7 @@ object Dependencies {
   // JLine 3 version must be coordinated together with JAnsi version
   // and the JLine 2 fork version, which uses the same JAnsi
   val jline =
-    "org.scala-sbt.jline" % "jline" % "2.14.7-sbt-9c3b6aca11c57e339441442bbf58e550cdfecb79"
+    "org.scala-sbt.jline" % "jline" % "2.14.7-sbt-9a88bc413e2b34a4580c001c654d1a7f4f65bf18"
   val jline3Version = "3.27.1"
   val jline3Terminal = "org.jline" % "jline-terminal" % jline3Version
   val jline3JNI = "org.jline" % "jline-terminal-jni" % jline3Version
@@ -119,7 +119,7 @@ object Dependencies {
 
   // lm-coursier dependencies
   val dataclassScalafixVersion = "0.1.0"
-  val coursierVersion = "2.1.19"
+  val coursierVersion = "2.1.23"
 
   val coursier = ("io.get-coursier" %% "coursier" % coursierVersion)
     .cross(CrossVersion.for3Use2_13)
diff --git a/project/build.properties b/project/build.properties
index db1723b08..73df629ac 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.10.5
+sbt.version=1.10.7
diff --git a/protocol/src/main/contraband-scala/sbt/internal/bsp/JvmBuildTarget.scala b/protocol/src/main/contraband-scala/sbt/internal/bsp/JvmBuildTarget.scala
new file mode 100644
index 000000000..0c09fef57
--- /dev/null
+++ b/protocol/src/main/contraband-scala/sbt/internal/bsp/JvmBuildTarget.scala
@@ -0,0 +1,48 @@
+/**
+ * This code is generated using [[https://www.scala-sbt.org/contraband]].
+ */
+
+// DO NOT EDIT MANUALLY
+package sbt.internal.bsp
+/**
+ * Contains jvm-specific metadata, specifically JDK reference
+ * @param javaHome Uri representing absolute path to jdk
+ * @param javaVersion The java version this target is supposed to use (can be set using javac `-target` flag)
+ */
+final class JvmBuildTarget private (
+  val javaHome: Option[java.net.URI],
+  val javaVersion: Option[String]) extends Serializable {
+  
+  
+  
+  override def equals(o: Any): Boolean = this.eq(o.asInstanceOf[AnyRef]) || (o match {
+    case x: JvmBuildTarget => (this.javaHome == x.javaHome) && (this.javaVersion == x.javaVersion)
+    case _ => false
+  })
+  override def hashCode: Int = {
+    37 * (37 * (37 * (17 + "sbt.internal.bsp.JvmBuildTarget".##) + javaHome.##) + javaVersion.##)
+  }
+  override def toString: String = {
+    "JvmBuildTarget(" + javaHome + ", " + javaVersion + ")"
+  }
+  private def copy(javaHome: Option[java.net.URI] = javaHome, javaVersion: Option[String] = javaVersion): JvmBuildTarget = {
+    new JvmBuildTarget(javaHome, javaVersion)
+  }
+  def withJavaHome(javaHome: Option[java.net.URI]): JvmBuildTarget = {
+    copy(javaHome = javaHome)
+  }
+  def withJavaHome(javaHome: java.net.URI): JvmBuildTarget = {
+    copy(javaHome = Option(javaHome))
+  }
+  def withJavaVersion(javaVersion: Option[String]): JvmBuildTarget = {
+    copy(javaVersion = javaVersion)
+  }
+  def withJavaVersion(javaVersion: String): JvmBuildTarget = {
+    copy(javaVersion = Option(javaVersion))
+  }
+}
+object JvmBuildTarget {
+  
+  def apply(javaHome: Option[java.net.URI], javaVersion: Option[String]): JvmBuildTarget = new JvmBuildTarget(javaHome, javaVersion)
+  def apply(javaHome: java.net.URI, javaVersion: String): JvmBuildTarget = new JvmBuildTarget(Option(javaHome), Option(javaVersion))
+}
diff --git a/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaBuildTarget.scala b/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaBuildTarget.scala
index 7467cf26e..1c569eef1 100644
--- a/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaBuildTarget.scala
+++ b/protocol/src/main/contraband-scala/sbt/internal/bsp/ScalaBuildTarget.scala
@@ -14,28 +14,30 @@ package sbt.internal.bsp
                              For example, 2.12 if scalaVersion is 2.12.4.
  * @param platform The target platform for this target
  * @param jars A sequence of Scala jars such as scala-library, scala-compiler and scala-reflect.
+ * @param jvmBuildTarget The jvm build target describing jdk to be used
  */
 final class ScalaBuildTarget private (
   val scalaOrganization: String,
   val scalaVersion: String,
   val scalaBinaryVersion: String,
   val platform: Int,
-  val jars: Vector[String]) extends Serializable {
+  val jars: Vector[String],
+  val jvmBuildTarget: Option[sbt.internal.bsp.JvmBuildTarget]) extends Serializable {
   
   
   
   override def equals(o: Any): Boolean = this.eq(o.asInstanceOf[AnyRef]) || (o match {
-    case x: ScalaBuildTarget => (this.scalaOrganization == x.scalaOrganization) && (this.scalaVersion == x.scalaVersion) && (this.scalaBinaryVersion == x.scalaBinaryVersion) && (this.platform == x.platform) && (this.jars == x.jars)
+    case x: ScalaBuildTarget => (this.scalaOrganization == x.scalaOrganization) && (this.scalaVersion == x.scalaVersion) && (this.scalaBinaryVersion == x.scalaBinaryVersion) && (this.platform == x.platform) && (this.jars == x.jars) && (this.jvmBuildTarget == x.jvmBuildTarget)
     case _ => false
   })
   override def hashCode: Int = {
-    37 * (37 * (37 * (37 * (37 * (37 * (17 + "sbt.internal.bsp.ScalaBuildTarget".##) + scalaOrganization.##) + scalaVersion.##) + scalaBinaryVersion.##) + platform.##) + jars.##)
+    37 * (37 * (37 * (37 * (37 * (37 * (37 * (17 + "sbt.internal.bsp.ScalaBuildTarget".##) + scalaOrganization.##) + scalaVersion.##) + scalaBinaryVersion.##) + platform.##) + jars.##) + jvmBuildTarget.##)
   }
   override def toString: String = {
-    "ScalaBuildTarget(" + scalaOrganization + ", " + scalaVersion + ", " + scalaBinaryVersion + ", " + platform + ", " + jars + ")"
+    "ScalaBuildTarget(" + scalaOrganization + ", " + scalaVersion + ", " + scalaBinaryVersion + ", " + platform + ", " + jars + ", " + jvmBuildTarget + ")"
   }
-  private def copy(scalaOrganization: String = scalaOrganization, scalaVersion: String = scalaVersion, scalaBinaryVersion: String = scalaBinaryVersion, platform: Int = platform, jars: Vector[String] = jars): ScalaBuildTarget = {
-    new ScalaBuildTarget(scalaOrganization, scalaVersion, scalaBinaryVersion, platform, jars)
+  private def copy(scalaOrganization: String = scalaOrganization, scalaVersion: String = scalaVersion, scalaBinaryVersion: String = scalaBinaryVersion, platform: Int = platform, jars: Vector[String] = jars, jvmBuildTarget: Option[sbt.internal.bsp.JvmBuildTarget] = jvmBuildTarget): ScalaBuildTarget = {
+    new ScalaBuildTarget(scalaOrganization, scalaVersion, scalaBinaryVersion, platform, jars, jvmBuildTarget)
   }
   def withScalaOrganization(scalaOrganization: String): ScalaBuildTarget = {
     copy(scalaOrganization = scalaOrganization)
@@ -52,8 +54,15 @@ final class ScalaBuildTarget private (
   def withJars(jars: Vector[String]): ScalaBuildTarget = {
     copy(jars = jars)
   }
+  def withJvmBuildTarget(jvmBuildTarget: Option[sbt.internal.bsp.JvmBuildTarget]): ScalaBuildTarget = {
+    copy(jvmBuildTarget = jvmBuildTarget)
+  }
+  def withJvmBuildTarget(jvmBuildTarget: sbt.internal.bsp.JvmBuildTarget): ScalaBuildTarget = {
+    copy(jvmBuildTarget = Option(jvmBuildTarget))
+  }
 }
 object ScalaBuildTarget {
   
-  def apply(scalaOrganization: String, scalaVersion: String, scalaBinaryVersion: String, platform: Int, jars: Vector[String]): ScalaBuildTarget = new ScalaBuildTarget(scalaOrganization, scalaVersion, scalaBinaryVersion, platform, jars)
+  def apply(scalaOrganization: String, scalaVersion: String, scalaBinaryVersion: String, platform: Int, jars: Vector[String], jvmBuildTarget: Option[sbt.internal.bsp.JvmBuildTarget]): ScalaBuildTarget = new ScalaBuildTarget(scalaOrganization, scalaVersion, scalaBinaryVersion, platform, jars, jvmBuildTarget)
+  def apply(scalaOrganization: String, scalaVersion: String, scalaBinaryVersion: String, platform: Int, jars: Vector[String], jvmBuildTarget: sbt.internal.bsp.JvmBuildTarget): ScalaBuildTarget = new ScalaBuildTarget(scalaOrganization, scalaVersion, scalaBinaryVersion, platform, jars, Option(jvmBuildTarget))
 }
diff --git a/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/JsonProtocol.scala b/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/JsonProtocol.scala
index 491e3caf1..5b601a070 100644
--- a/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/JsonProtocol.scala
+++ b/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/JsonProtocol.scala
@@ -56,6 +56,7 @@ trait JsonProtocol extends sjsonnew.BasicJsonProtocol
   with sbt.internal.bsp.codec.TestResultFormats
   with sbt.internal.bsp.codec.RunParamsFormats
   with sbt.internal.bsp.codec.RunResultFormats
+  with sbt.internal.bsp.codec.JvmBuildTargetFormats
   with sbt.internal.bsp.codec.ScalaBuildTargetFormats
   with sbt.internal.bsp.codec.ScalacOptionsParamsFormats
   with sbt.internal.bsp.codec.ScalacOptionsItemFormats
diff --git a/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/JvmBuildTargetFormats.scala b/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/JvmBuildTargetFormats.scala
new file mode 100644
index 000000000..ec7c26f9e
--- /dev/null
+++ b/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/JvmBuildTargetFormats.scala
@@ -0,0 +1,29 @@
+/**
+ * This code is generated using [[https://www.scala-sbt.org/contraband]].
+ */
+
+// DO NOT EDIT MANUALLY
+package sbt.internal.bsp.codec
+import _root_.sjsonnew.{ Unbuilder, Builder, JsonFormat, deserializationError }
+trait JvmBuildTargetFormats { self: sjsonnew.BasicJsonProtocol =>
+implicit lazy val JvmBuildTargetFormat: JsonFormat[sbt.internal.bsp.JvmBuildTarget] = new JsonFormat[sbt.internal.bsp.JvmBuildTarget] {
+  override def read[J](__jsOpt: Option[J], unbuilder: Unbuilder[J]): sbt.internal.bsp.JvmBuildTarget = {
+    __jsOpt match {
+      case Some(__js) =>
+      unbuilder.beginObject(__js)
+      val javaHome = unbuilder.readField[Option[java.net.URI]]("javaHome")
+      val javaVersion = unbuilder.readField[Option[String]]("javaVersion")
+      unbuilder.endObject()
+      sbt.internal.bsp.JvmBuildTarget(javaHome, javaVersion)
+      case None =>
+      deserializationError("Expected JsObject but found None")
+    }
+  }
+  override def write[J](obj: sbt.internal.bsp.JvmBuildTarget, builder: Builder[J]): Unit = {
+    builder.beginObject()
+    builder.addField("javaHome", obj.javaHome)
+    builder.addField("javaVersion", obj.javaVersion)
+    builder.endObject()
+  }
+}
+}
diff --git a/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/SbtBuildTargetFormats.scala b/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/SbtBuildTargetFormats.scala
index 226def574..d5d5ab807 100644
--- a/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/SbtBuildTargetFormats.scala
+++ b/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/SbtBuildTargetFormats.scala
@@ -5,7 +5,7 @@
 // DO NOT EDIT MANUALLY
 package sbt.internal.bsp.codec
 import _root_.sjsonnew.{ Unbuilder, Builder, JsonFormat, deserializationError }
-trait SbtBuildTargetFormats { self: sbt.internal.bsp.codec.ScalaBuildTargetFormats & sjsonnew.BasicJsonProtocol & sbt.internal.bsp.codec.BuildTargetIdentifierFormats =>
+trait SbtBuildTargetFormats { self: sbt.internal.bsp.codec.ScalaBuildTargetFormats & sbt.internal.bsp.codec.JvmBuildTargetFormats & sjsonnew.BasicJsonProtocol & sbt.internal.bsp.codec.BuildTargetIdentifierFormats =>
 implicit lazy val SbtBuildTargetFormat: JsonFormat[sbt.internal.bsp.SbtBuildTarget] = new JsonFormat[sbt.internal.bsp.SbtBuildTarget] {
   override def read[J](__jsOpt: Option[J], unbuilder: Unbuilder[J]): sbt.internal.bsp.SbtBuildTarget = {
     __jsOpt match {
diff --git a/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/ScalaBuildTargetFormats.scala b/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/ScalaBuildTargetFormats.scala
index 565ca7da6..6e0eb9c88 100644
--- a/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/ScalaBuildTargetFormats.scala
+++ b/protocol/src/main/contraband-scala/sbt/internal/bsp/codec/ScalaBuildTargetFormats.scala
@@ -5,7 +5,7 @@
 // DO NOT EDIT MANUALLY
 package sbt.internal.bsp.codec
 import _root_.sjsonnew.{ Unbuilder, Builder, JsonFormat, deserializationError }
-trait ScalaBuildTargetFormats { self: sjsonnew.BasicJsonProtocol =>
+trait ScalaBuildTargetFormats { self: sbt.internal.bsp.codec.JvmBuildTargetFormats & sjsonnew.BasicJsonProtocol =>
 implicit lazy val ScalaBuildTargetFormat: JsonFormat[sbt.internal.bsp.ScalaBuildTarget] = new JsonFormat[sbt.internal.bsp.ScalaBuildTarget] {
   override def read[J](__jsOpt: Option[J], unbuilder: Unbuilder[J]): sbt.internal.bsp.ScalaBuildTarget = {
     __jsOpt match {
@@ -16,8 +16,9 @@ implicit lazy val ScalaBuildTargetFormat: JsonFormat[sbt.internal.bsp.ScalaBuild
       val scalaBinaryVersion = unbuilder.readField[String]("scalaBinaryVersion")
       val platform = unbuilder.readField[Int]("platform")
       val jars = unbuilder.readField[Vector[String]]("jars")
+      val jvmBuildTarget = unbuilder.readField[Option[sbt.internal.bsp.JvmBuildTarget]]("jvmBuildTarget")
       unbuilder.endObject()
-      sbt.internal.bsp.ScalaBuildTarget(scalaOrganization, scalaVersion, scalaBinaryVersion, platform, jars)
+      sbt.internal.bsp.ScalaBuildTarget(scalaOrganization, scalaVersion, scalaBinaryVersion, platform, jars, jvmBuildTarget)
       case None =>
       deserializationError("Expected JsObject but found None")
     }
@@ -29,6 +30,7 @@ implicit lazy val ScalaBuildTargetFormat: JsonFormat[sbt.internal.bsp.ScalaBuild
     builder.addField("scalaBinaryVersion", obj.scalaBinaryVersion)
     builder.addField("platform", obj.platform)
     builder.addField("jars", obj.jars)
+    builder.addField("jvmBuildTarget", obj.jvmBuildTarget)
     builder.endObject()
   }
 }
diff --git a/protocol/src/main/contraband/bsp.contra b/protocol/src/main/contraband/bsp.contra
index 398d1a048..e9e1c2fab 100644
--- a/protocol/src/main/contraband/bsp.contra
+++ b/protocol/src/main/contraband/bsp.contra
@@ -615,6 +615,17 @@ type RunResult {
 }
 
 
+# JVM extension
+
+## Contains jvm-specific metadata, specifically JDK reference
+type JvmBuildTarget {
+  ## Uri representing absolute path to jdk
+  javaHome: java.net.URI
+
+  ## The java version this target is supposed to use (can be set using javac `-target` flag)
+  javaVersion: String
+}
+
 # Scala Extension
 
 ## Contains scala-specific metadata for compiling a target containing Scala sources.
@@ -636,6 +647,9 @@ type ScalaBuildTarget {
 
   ## A sequence of Scala jars such as scala-library, scala-compiler and scala-reflect.
   jars: [String]!
+
+  ## The jvm build target describing jdk to be used
+  jvmBuildTarget: sbt.internal.bsp.JvmBuildTarget
 }
 
 ## Scalac options
diff --git a/sbt b/sbt
index 2b57b2396..b15572814 100755
--- a/sbt
+++ b/sbt
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
 set +e
-declare builtin_sbt_version="1.10.6"
+declare builtin_sbt_version="1.10.7"
 declare -a residual_args
 declare -a java_args
 declare -a scalac_args
@@ -25,6 +25,7 @@ declare use_sbtn=
 declare no_server=
 declare sbtn_command="$SBTN_CMD"
 declare sbtn_version="1.10.5"
+declare use_colors=1
 
 ###  ------------------------------- ###
 ###  Helper methods for BASH scripts ###
@@ -104,6 +105,15 @@ declare -r sbt_home="$(dirname "$sbt_bin_dir")"
 echoerr () {
   echo 1>&2 "$@"
 }
+RED='\033[0;31m'
+NC='\033[0m' # No Color
+echoerr_error () {
+  if [[ $use_colors == "1" ]]; then
+    echoerr -e "[${RED}error${NC}] $@"
+  else
+    echoerr "[error] $@"
+  fi
+}
 vlog () {
   [[ $sbt_verbose || $sbt_debug ]] && echoerr "$@"
 }
@@ -486,6 +496,21 @@ copyRt() {
   fi
 }
 
+# Confirm a user's intent if the current directory does not look like an sbt
+# top-level directory and neither the --allow-empty option nor the "new" command was given.
+checkWorkingDirectory() {
+  if [[ ! -n "$allow_empty" ]]; then
+    [[ -f ./build.sbt || -d ./project || -n "$sbt_new" ]] || {
+      echoerr_error "Neither build.sbt nor a 'project' directory in the current directory: $(pwd)"
+      echoerr_error "run 'sbt new', touch build.sbt, or run 'sbt --allow-empty'."
+      echoerr_error ""
+      echoerr_error "To opt out of this check, create ${config_home}/sbtopts with:"
+      echoerr_error "--allow-empty"
+      exit 1
+    }
+  fi
+}
+
 run() {
   # Copy preloaded repo to user's preloaded directory
   syncPreloaded
@@ -522,6 +547,7 @@ run() {
     done
     echo "shutdown ${#sbt_processes[@]} sbt processes"
   else
+    checkWorkingDirectory
     # run sbt
     execRunner "$java_cmd" \
       "${java_args[@]}" \
@@ -546,7 +572,10 @@ declare -r sbt_opts_file=".sbtopts"
 declare -r build_props_file="$(pwd)/project/build.properties"
 declare -r etc_sbt_opts_file="/etc/sbt/sbtopts"
 # this allows /etc/sbt/sbtopts location to be changed
-declare -r etc_file="${SBT_ETC_FILE:-$etc_sbt_opts_file}"
+declare machine_sbt_opts_file="${etc_sbt_opts_file}"
+declare config_home="${XDG_CONFIG_HOME:-$HOME/.config}/sbt"
+[[ -f "${config_home}/sbtopts" ]] && machine_sbt_opts_file="${config_home}/sbtopts"
+[[ -f "$SBT_ETC_FILE" ]] && machine_sbt_opts_file="$SBT_ETC_FILE"
 declare -r dist_sbt_opts_file="${sbt_home}/conf/sbtopts"
 declare -r win_sbt_opts_file="${sbt_home}/conf/sbtconfig.txt"
 declare sbt_jar="$(jar_file)"
@@ -571,7 +600,7 @@ Usage: `basename "$0"` [options]
                       enable or disable supershell            (sbt 1.3 and above)
   --traces            generate Trace Event report on shutdown (sbt 1.3 and above)
   --timings           display task timings report on shutdown
-  --sbt-create        start sbt even if current directory contains no sbt project
+  --allow-empty       start sbt even if current directory contains no sbt project
   --sbt-dir   <path>  path to global settings/plugins directory (default: ~/.sbt)
   --sbt-boot  <path>  path to shared boot directory (default: ~/.sbt/boot in 0.11 series)
   --sbt-cache <path>  path to global cache directory (default: operating system specific)
@@ -610,7 +639,7 @@ process_my_args () {
     case "$1" in
              -batch|--batch) exec </dev/null && shift ;; #>
 
-   -sbt-create|--sbt-create) sbt_create=true && shift ;;
+   -allow-empty|--allow-empty|-sbt-create|--sbt-create) allow_empty=true && shift ;;
 
                         new) sbt_new=true && addResidual "$1" && shift ;;
 
@@ -620,23 +649,6 @@ process_my_args () {
 
   # Now, ensure sbt version is used.
   [[ "${sbt_version}XXX" != "XXX" ]] && addJava "-Dsbt.version=$sbt_version"
-
-  # Confirm a user's intent if the current directory does not look like an sbt
-  # top-level directory and neither the -sbt-create option nor the "new"
-  # command was given.
-  [[ -f ./build.sbt || -d ./project || -n "$sbt_create" || -n "$sbt_new" ]] || {
-    echo "[warn] Neither build.sbt nor a 'project' directory in the current directory: $(pwd)"
-    while true; do
-      echo 'c) continue'
-      echo 'q) quit'
-
-      read -p '? ' || exit 1
-      case "$REPLY" in
-        c|C) break ;;
-        q|Q) exit 1 ;;
-      esac
-    done
-  }
 }
 
 ## map over argument array. this is used to process both command line arguments and SBT_OPTS
@@ -697,6 +709,7 @@ process_args () {
                              export PATH="$2/bin:$PATH" &&
                              shift 2 ;;
 
+ -Dsbt.color=never|-Dsbt.log.noformat=true) addJava "$1" && use_colors=0 && shift ;;
                   "-D*"|-D*) addJava "$1" && shift ;;
                         -J*) addJava "${1:2}" && shift ;;
                           *) addResidual "$1" && shift ;;
@@ -788,11 +801,13 @@ runNativeClient() {
 
 original_args=("$@")
 
-# Here we pull in the default settings configuration.
-[[ -f "$dist_sbt_opts_file" ]] && set -- $(loadConfigFile "$dist_sbt_opts_file") "$@"
-
-# Here we pull in the global settings configuration.
-[[ -f "$etc_file" ]] && set -- $(loadConfigFile "$etc_file") "$@"
+# Pull in the machine-wide settings configuration.
+if [[ -f "$machine_sbt_opts_file" ]]; then
+  set -- $(loadConfigFile "$machine_sbt_opts_file") "$@"
+else
+  # Otherwise pull in the default settings configuration.
+  [[ -f "$dist_sbt_opts_file" ]] && set -- $(loadConfigFile "$dist_sbt_opts_file") "$@"
+fi
 
 # Pull in the project-level config file, if it exists.
 [[ -f "$sbt_opts_file" ]] && set -- $(loadConfigFile "$sbt_opts_file") "$@"
diff --git a/sbt-app/src/sbt-test/actions/add-alias/test b/sbt-app/src/sbt-test/actions/add-alias/test
index 0269ab4f8..9a7db3782 100644
--- a/sbt-app/src/sbt-test/actions/add-alias/test
+++ b/sbt-app/src/sbt-test/actions/add-alias/test
@@ -2,3 +2,5 @@
 -> demo-failure
 > +z
 > z
+
+$ absent /tmp/non-existent
diff --git a/sbt-app/src/sbt-test/dependency-graph/ignoreScalaLibrary/build.sbt b/sbt-app/src/sbt-test/dependency-graph/ignoreScalaLibrary/build.sbt
index fae8cacab..c05b42e71 100644
--- a/sbt-app/src/sbt-test/dependency-graph/ignoreScalaLibrary/build.sbt
+++ b/sbt-app/src/sbt-test/dependency-graph/ignoreScalaLibrary/build.sbt
@@ -4,6 +4,7 @@ libraryDependencies ++= Seq(
   "org.slf4j" % "slf4j-api" % "1.7.2",
   "ch.qos.logback" % "logback-classic" % "1.0.7"
 )
+csrMavenDependencyOverride := false
 
 TaskKey[Unit]("check") := {
   val report = updateFull.value
diff --git a/sbt-app/src/sbt-test/dependency-graph/ignoreScalaLibrary/pending b/sbt-app/src/sbt-test/dependency-graph/ignoreScalaLibrary/test
similarity index 100%
rename from sbt-app/src/sbt-test/dependency-graph/ignoreScalaLibrary/pending
rename to sbt-app/src/sbt-test/dependency-graph/ignoreScalaLibrary/test
diff --git a/sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/a/A.scala b/sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/a/A.scala
new file mode 100644
index 000000000..c66551e1b
--- /dev/null
+++ b/sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/a/A.scala
@@ -0,0 +1,27 @@
+import scala.language.reflectiveCalls
+
+
+package scala.collection.immutable {
+  object Exp {
+    // Access RedBlackTree.validate added in Scala 2.13.13
+    def v = RedBlackTree.validate(null)(null)
+  }
+}
+
+
+object A extends App {
+  println(scala.util.Properties.versionString)
+}
+
+object AMacro {
+  import scala.language.experimental.macros
+  import scala.reflect.macros.blackbox.Context
+
+  def m(x: Int): Int = macro impl
+
+  def impl(c: Context)(x: c.Expr[Int]): c.Expr[Int] = {
+    import c.universe._
+    println(scala.collection.immutable.Exp.v)
+    c.Expr(q"2 + $x")
+  }
+}
diff --git a/sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/b/B.scala b/sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/b/B.scala
new file mode 100644
index 000000000..f75b7905e
--- /dev/null
+++ b/sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/b/B.scala
@@ -0,0 +1,7 @@
+import java.nio.file.{Paths, Files}
+import java.nio.charset.StandardCharsets
+
+object B extends App {
+  println(AMacro.m(33)) // fails
+  Files.write(Paths.get(s"s${scala.util.Properties.versionNumberString}.txt"), "nix".getBytes)
+}
diff --git a/sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/build.sbt b/sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/build.sbt
new file mode 100644
index 000000000..c757f2648
--- /dev/null
+++ b/sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/build.sbt
@@ -0,0 +1,39 @@
+import sbt.librarymanagement.InclExclRule
+
+lazy val a = project.settings(
+  scalaVersion := "2.13.13",
+  libraryDependencies += "org.scala-lang" % "scala-reflect" % scalaVersion.value,
+  TaskKey[Unit]("checkLibs") := checkLibs("2.13.13", (Compile/dependencyClasspath).value, ".*scala-(library|reflect).*"),
+)
+
+lazy val b = project.dependsOn(a).settings(
+  allowUnsafeScalaLibUpgrade := true,
+  scalaVersion := "2.13.12",
+
+  // dependencies are upgraded to 2.13.13
+  TaskKey[Unit]("checkLibs") := checkLibs("2.13.13", (Compile/dependencyClasspath).value, ".*scala-(library|reflect).*"),
+
+  // check the compiler uses the 2.13.12 library on its runtime classpath
+  TaskKey[Unit]("checkScala") := {
+    val i = scalaInstance.value
+    i.libraryJars.filter(_.toString.contains("scala-library")).toList match {
+      case List(l) => assert(l.toString.contains("2.13.12"), i.toString)
+    }
+    assert(i.compilerJars.filter(_.toString.contains("scala-library")).isEmpty, i.toString)
+    assert(i.otherJars.filter(_.toString.contains("scala-library")).isEmpty, i.toString)
+  },
+)
+
+lazy val c = project.dependsOn(a).settings(
+  allowUnsafeScalaLibUpgrade := true,
+  scalaVersion := "2.13.12",
+  TaskKey[Unit]("checkLibs") := checkLibs("2.13.13", (Compile/dependencyClasspath).value, ".*scala-(library|reflect).*"),
+)
+
+def checkLibs(v: String, cp: Classpath, filter: String): Unit = {
+  for (p <- cp)
+    if (p.toString.matches(filter)) {
+      println(s"$p -- $v")
+      assert(p.toString.contains(v), p)
+    }
+}
diff --git a/sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/c/C.scala b/sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/c/C.scala
new file mode 100644
index 000000000..de0f7c084
--- /dev/null
+++ b/sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/c/C.scala
@@ -0,0 +1,7 @@
+import java.nio.file.{Paths, Files}
+import java.nio.charset.StandardCharsets
+
+object C extends App {
+  assert(scala.collection.immutable.Exp.v == null)
+  Files.write(Paths.get(s"s${scala.util.Properties.versionNumberString}.txt"), "nix".getBytes)
+}
diff --git a/sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/test b/sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/test
new file mode 100644
index 000000000..27080878d
--- /dev/null
+++ b/sbt-app/src/sbt-test/dependency-management/stdlib-unfreeze-warn/test
@@ -0,0 +1,11 @@
+> a/checkLibs
+> b/checkLibs
+> b/checkScala
+> c/checkLibs
+
+# macro expansion fails
+-> b/compile
+
+> c/runBlock
+$ exists s2.13.13.txt
+$ delete s2.13.13.txt
diff --git a/sbt-app/src/sbt-test/project1/scripted13/test b/sbt-app/src/sbt-test/project1/scripted13/test
index b321a8554..2fd6077fb 100644
--- a/sbt-app/src/sbt-test/project1/scripted13/test
+++ b/sbt-app/src/sbt-test/project1/scripted13/test
@@ -1,6 +1,6 @@
 # This tests that this sbt scripted plugin can launch the previous one
 
-> ^^1.10.5
+> ^^1.10.7
 
 $ copy-file changes/A.scala src/sbt-test/a/b/A.scala
 > scripted
diff --git a/server-test/src/test/scala/testpkg/BuildServerTest.scala b/server-test/src/test/scala/testpkg/BuildServerTest.scala
index c3d6d929a..989e75a20 100644
--- a/server-test/src/test/scala/testpkg/BuildServerTest.scala
+++ b/server-test/src/test/scala/testpkg/BuildServerTest.scala
@@ -17,7 +17,7 @@ import sjsonnew.support.scalajson.unsafe.{ CompactPrinter, Converter }
 
 import java.io.File
 import java.net.URI
-import java.nio.file.Files
+import java.nio.file.{ Files, Paths }
 import java.util.concurrent.atomic.AtomicInteger
 import scala.concurrent.duration.*
 
@@ -57,6 +57,16 @@ class BuildServerTest extends AbstractServerTest {
         case None    => sys.error(s"buildserver-root-build not in ${result.targets}")
     assert(buildServerBuildTarget.id.uri.toString.endsWith("#buildserver-root-build"))
     assert(!result.targets.exists(_.displayName.contains("badBuildTarget")))
+    // Check for JVM based Scala Project, built target should contain Java version information
+    val scalaBuildTarget =
+      Converter.fromJsonOptionUnsafe[ScalaBuildTarget](utilTarget.data)
+    val javaTarget = scalaBuildTarget.jvmBuildTarget
+    (javaTarget.flatMap(_.javaVersion), javaTarget.flatMap(_.javaHome)) match {
+      case (Some(javaVersion), Some(javaHome)) =>
+        assert(javaVersion.equals(sys.props("java.version")))
+        assert(javaHome.equals(Paths.get(sys.props("java.home")).toUri))
+      case _ => fail("JVM build target should contain javaVersion and javaHome")
+    }
   }
 
   test("buildTarget/sources") {