diff --git a/compiler/src/dotty/tools/backend/jvm/BackendUtils.scala b/compiler/src/dotty/tools/backend/jvm/BackendUtils.scala
index d54364b1675f..2eaaccdd441d 100644
--- a/compiler/src/dotty/tools/backend/jvm/BackendUtils.scala
+++ b/compiler/src/dotty/tools/backend/jvm/BackendUtils.scala
@@ -35,6 +35,7 @@ class BackendUtils(val postProcessor: PostProcessor) {
     case "18" => asm.Opcodes.V18
     case "19" => asm.Opcodes.V19
     case "20" => asm.Opcodes.V20
+    case "21" => asm.Opcodes.V21
   }
 
   lazy val extraProc: Int = {
diff --git a/compiler/src/dotty/tools/dotc/config/ScalaSettings.scala b/compiler/src/dotty/tools/dotc/config/ScalaSettings.scala
index 32cb030a3296..c06aa304ef72 100644
--- a/compiler/src/dotty/tools/dotc/config/ScalaSettings.scala
+++ b/compiler/src/dotty/tools/dotc/config/ScalaSettings.scala
@@ -17,7 +17,7 @@ class ScalaSettings extends SettingGroup with AllScalaSettings
 object ScalaSettings:
   // Keep synchronized with `classfileVersion` in `BackendUtils`
   private val minTargetVersion = 8
-  private val maxTargetVersion = 20
+  private val maxTargetVersion = 21
 
   def supportedTargetVersions: List[String] =
     (minTargetVersion to maxTargetVersion).toList.map(_.toString)
diff --git a/project/Build.scala b/project/Build.scala
index 82b7fee64879..2689aa65f972 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -547,7 +547,7 @@ object Build {
 
       // get libraries onboard
       libraryDependencies ++= Seq(
-        "org.scala-lang.modules" % "scala-asm" % "9.4.0-scala-1", // used by the backend
+        "org.scala-lang.modules" % "scala-asm" % "9.5.0-scala-1", // used by the backend
         Dependencies.oldCompilerInterface, // we stick to the old version to avoid deprecation warnings
         "org.jline" % "jline-reader" % "3.19.0",   // used by the REPL
         "org.jline" % "jline-terminal" % "3.19.0",
diff --git a/tests/pos-with-compiler-cc/backend/jvm/BCodeIdiomatic.scala b/tests/pos-with-compiler-cc/backend/jvm/BCodeIdiomatic.scala
index 77e58440aa97..5eb8d7a52aa2 100644
--- a/tests/pos-with-compiler-cc/backend/jvm/BCodeIdiomatic.scala
+++ b/tests/pos-with-compiler-cc/backend/jvm/BCodeIdiomatic.scala
@@ -54,7 +54,8 @@ trait BCodeIdiomatic extends caps.Pure {
     case "17" => asm.Opcodes.V17
     case "18" => asm.Opcodes.V18
     case "19" => asm.Opcodes.V19
-    case "20" => asm.Opcodes.V20*/
+    case "20" => asm.Opcodes.V20
+    case "21" => asm.Opcodes.V21*/
   }
 
   lazy val majorVersion: Int = (classfileVersion & 0xFF)
diff --git a/tests/pos-with-compiler-cc/dotc/config/ScalaSettings.scala b/tests/pos-with-compiler-cc/dotc/config/ScalaSettings.scala
index f7743dddda4e..20708b98cc95 100644
--- a/tests/pos-with-compiler-cc/dotc/config/ScalaSettings.scala
+++ b/tests/pos-with-compiler-cc/dotc/config/ScalaSettings.scala
@@ -17,7 +17,7 @@ class ScalaSettings extends SettingGroup with AllScalaSettings
 object ScalaSettings:
   // Keep synchronized with `classfileVersion` in `BCodeIdiomatic`
   private val minTargetVersion = 8
-  private val maxTargetVersion = 20
+  private val maxTargetVersion = 21
 
   def supportedTargetVersions: List[String] =
     (minTargetVersion to maxTargetVersion).toList.map(_.toString)