diff --git a/amm/interp/src/main/scala/ammonite/interp/script/AmmoniteBuildServer.scala b/amm/interp/src/main/scala/ammonite/interp/script/AmmoniteBuildServer.scala
index e2e3c3e63..d5865786c 100644
--- a/amm/interp/src/main/scala/ammonite/interp/script/AmmoniteBuildServer.scala
+++ b/amm/interp/src/main/scala/ammonite/interp/script/AmmoniteBuildServer.scala
@@ -126,7 +126,6 @@ class AmmoniteBuildServer(
     clientOpt = Some(client)
   }
 
-
   def buildInitialize(params: InitializeBuildParams): CompletableFuture[InitializeBuildResult] =
     nonBlocking {
 
diff --git a/amm/interp/src/main/scala/ammonite/interp/script/DummyBuildServerImplems.scala b/amm/interp/src/main/scala/ammonite/interp/script/DummyBuildServerImplems.scala
index f5c15ef30..dfc7ab9f2 100644
--- a/amm/interp/src/main/scala/ammonite/interp/script/DummyBuildServerImplems.scala
+++ b/amm/interp/src/main/scala/ammonite/interp/script/DummyBuildServerImplems.scala
@@ -5,8 +5,13 @@ import ch.epfl.scala.bsp4j._
 import scala.collection.JavaConverters._
 
 private[script] trait DummyBuildServerImplems extends BuildServer with ScalaBuildServer {
+  override def buildTargetDependencyModules(dmp: DependencyModulesParams): CompletableFuture[DependencyModulesResult] =
+    CompletableFuture.completedFuture(new DependencyModulesResult(List.empty.asJava))
 
-  def buildTargetResources(params: ResourcesParams): CompletableFuture[ResourcesResult] = {
+  override def buildTargetOutputPaths(opp: OutputPathsParams): CompletableFuture[OutputPathsResult] =
+    CompletableFuture.completedFuture(new OutputPathsResult(List.empty.asJava))
+
+  override def buildTargetResources(params: ResourcesParams): CompletableFuture[ResourcesResult] = {
     val items = params.getTargets.asScala.toList.map { target =>
       new ResourcesItem(target, List.empty[String].asJava)
     }
@@ -14,20 +19,19 @@ private[script] trait DummyBuildServerImplems extends BuildServer with ScalaBuil
     CompletableFuture.completedFuture(result)
   }
 
-  def buildTargetRun(params: RunParams): CompletableFuture[RunResult] = {
+  override def buildTargetRun(params: RunParams): CompletableFuture[RunResult] = {
     val result = new RunResult(StatusCode.ERROR)
     result.setOriginId(params.getOriginId)
     CompletableFuture.completedFuture(result)
   }
-  def buildTargetTest(params: TestParams): CompletableFuture[TestResult] = {
+
+  override def buildTargetTest(params: TestParams): CompletableFuture[TestResult] = {
     val result = new TestResult(StatusCode.ERROR)
     result.setOriginId(params.getOriginId)
     CompletableFuture.completedFuture(result)
   }
-  def onBuildExit(): Unit = ()
-  def onBuildInitialized(): Unit = ()
 
-  def buildTargetScalaMainClasses(
+  override def buildTargetScalaMainClasses(
     params: ScalaMainClassesParams
   ): CompletableFuture[ScalaMainClassesResult] = {
     val items = params.getTargets.asScala.map { target =>
@@ -36,7 +40,8 @@ private[script] trait DummyBuildServerImplems extends BuildServer with ScalaBuil
     val result = new ScalaMainClassesResult(items.asJava)
     CompletableFuture.completedFuture(result)
   }
-  def buildTargetScalaTestClasses(
+
+  override def buildTargetScalaTestClasses(
     params: ScalaTestClassesParams
   ): CompletableFuture[ScalaTestClassesResult] = {
     val items = params.getTargets.asScala.map { target =>
@@ -46,4 +51,12 @@ private[script] trait DummyBuildServerImplems extends BuildServer with ScalaBuil
     CompletableFuture.completedFuture(result)
   }
 
+  override def debugSessionStart(dsp: DebugSessionParams): CompletableFuture[DebugSessionAddress] =
+    CompletableFuture.completedFuture(new DebugSessionAddress(""))
+
+  override def onBuildExit(): Unit = ()
+  override def onBuildInitialized(): Unit = ()
+
+  override def workspaceReload(): CompletableFuture[Object] =
+    CompletableFuture.completedFuture(new {})
 }
diff --git a/build.sc b/build.sc
index ba92b8e66..6c7ae68ce 100644
--- a/build.sc
+++ b/build.sc
@@ -74,9 +74,9 @@ val (buildVersion, unstable) = scala.util.Try(
   case Some(tagName) => (tagName, false)
 }
 
-val bspVersion = "2.0.0-M6"
+val bspVersion = "2.1.0-M5"
 val fastparseVersion = "2.3.0"
-val scalametaVersion = "4.7.8"
+val scalametaVersion = "4.8.5"
 
 object Deps {
   val acyclic = ivy"com.lihaoyi:::acyclic:0.3.8"