diff --git a/compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt b/compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt
index 49de6db63a0..4a09169f0ba 100644
--- a/compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt
+++ b/compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt
@@ -362,6 +362,11 @@ class K2JSCompilerArguments : CommonCompilerArguments() {
         collector.deprecationWarn(irBaseClassInMetadata, false, "-Xir-base-class-in-metadata")
         collector.deprecationWarn(irNewIr2Js, true, "-Xir-new-ir2js")
 
+        if (languageVersion >= LanguageVersion.KOTLIN_1_9) {
+            collector.deprecationWarn(legacyDeprecatedNoWarn, false, "-Xlegacy-deprecated-no-warn")
+            collector.deprecationWarn(useDeprecatedLegacyCompiler, false, "-Xuse-deprecated-legacy-compiler")
+        }
+
         return super.configureAnalysisFlags(collector, languageVersion).also {
             it[allowFullyQualifiedNameInKClass] = wasm && wasmKClassFqn //Only enabled WASM BE supports this flag
         }
diff --git a/compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JSCompiler.java b/compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JSCompiler.java
index 162df537c5e..ccb680af87f 100644
--- a/compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JSCompiler.java
+++ b/compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JSCompiler.java
@@ -182,6 +182,13 @@ public class K2JSCompiler extends CLICompiler<K2JSCompilerArguments> {
             return exitCode;
         }
 
+        LanguageVersionSettings languageVersionSettings = CommonConfigurationKeysKt.getLanguageVersionSettings(configuration);
+
+        if (languageVersionSettings.getLanguageVersion().compareTo(LanguageVersion.KOTLIN_1_9) >= 0) {
+            messageCollector.report(ERROR, "Old Kotlin/JS compiler is no longer supported. Please migrate to the new JS IR backend", null);
+            return COMPILATION_ERROR;
+        }
+
         String deprecatedMessage = "==========\n" +
                                    "This project currently uses the Kotlin/JS Legacy compiler backend, which has been deprecated and will be removed in a future release.\n" +
                                    "\n" +
diff --git a/compiler/testData/cli/js/jsOldBackend.args b/compiler/testData/cli/js/jsOldBackend.args
new file mode 100644
index 00000000000..1c142de9aaf
--- /dev/null
+++ b/compiler/testData/cli/js/jsOldBackend.args
@@ -0,0 +1,7 @@
+$TESTDATA_DIR$/languageVersion.kt
+-Xlegacy-deprecated-no-warn
+-Xuse-deprecated-legacy-compiler
+-output
+$TEMP_DIR$/out.js
+-language-version
+1.9
\ No newline at end of file
diff --git a/compiler/testData/cli/js/jsOldBackend.out b/compiler/testData/cli/js/jsOldBackend.out
new file mode 100644
index 00000000000..f02e8d6ce06
--- /dev/null
+++ b/compiler/testData/cli/js/jsOldBackend.out
@@ -0,0 +1,3 @@
+warning: language version 1.9 is experimental, there are no backwards compatibility guarantees for new language and library features
+error: old Kotlin/JS compiler is no longer supported. Please migrate to the new JS IR backend
+COMPILATION_ERROR
diff --git a/compiler/tests-gen/org/jetbrains/kotlin/cli/CliTestGenerated.java b/compiler/tests-gen/org/jetbrains/kotlin/cli/CliTestGenerated.java
index e2df40d4c41..8be68e2b86d 100644
--- a/compiler/tests-gen/org/jetbrains/kotlin/cli/CliTestGenerated.java
+++ b/compiler/tests-gen/org/jetbrains/kotlin/cli/CliTestGenerated.java
@@ -1205,6 +1205,11 @@ public class CliTestGenerated extends AbstractCliTest {
             runTest("compiler/testData/cli/js/jsHelp.args");
         }
 
+        @TestMetadata("jsOldBackend.args")
+        public void testJsOldBackend() throws Exception {
+            runTest("compiler/testData/cli/js/jsOldBackend.args");
+        }
+
         @TestMetadata("kotlinHomeWithoutStdlib.args")
         public void testKotlinHomeWithoutStdlib() throws Exception {
             runTest("compiler/testData/cli/js/kotlinHomeWithoutStdlib.args");
diff --git a/compiler/tests/org/jetbrains/kotlin/jvm/compiler/CompileKotlinAgainstCustomBinariesTest.kt b/compiler/tests/org/jetbrains/kotlin/jvm/compiler/CompileKotlinAgainstCustomBinariesTest.kt
index 29d3ea1d63e..49bc063f192 100644
--- a/compiler/tests/org/jetbrains/kotlin/jvm/compiler/CompileKotlinAgainstCustomBinariesTest.kt
+++ b/compiler/tests/org/jetbrains/kotlin/jvm/compiler/CompileKotlinAgainstCustomBinariesTest.kt
@@ -294,17 +294,19 @@ class CompileKotlinAgainstCustomBinariesTest : AbstractKotlinCompilerIntegration
         doTestPreReleaseKotlinLibrary(K2JVMCompiler(), "library", tmpdir)
     }
 
-    fun testReleaseCompilerAgainstPreReleaseLibraryJs() {
-        doTestPreReleaseKotlinLibrary(K2JSCompiler(), "library", File(tmpdir, "usage.js"))
-    }
+//    https://youtrack.jetbrains.com/issue/KT-54905
+//    fun testReleaseCompilerAgainstPreReleaseLibraryJs() {
+//        doTestPreReleaseKotlinLibrary(K2JSCompiler(), "library", File(tmpdir, "usage.js"))
+//    }
 
     fun testReleaseCompilerAgainstPreReleaseLibrarySkipPrereleaseCheck() {
         doTestPreReleaseKotlinLibrary(K2JVMCompiler(), "library", tmpdir, "-Xskip-prerelease-check")
     }
 
-    fun testReleaseCompilerAgainstPreReleaseLibraryJsSkipPrereleaseCheck() {
-        doTestPreReleaseKotlinLibrary(K2JSCompiler(), "library", File(tmpdir, "usage.js"), "-Xskip-prerelease-check")
-    }
+//    https://youtrack.jetbrains.com/issue/KT-54905
+//    fun testReleaseCompilerAgainstPreReleaseLibraryJsSkipPrereleaseCheck() {
+//        doTestPreReleaseKotlinLibrary(K2JSCompiler(), "library", File(tmpdir, "usage.js"), "-Xskip-prerelease-check")
+//    }
 
     fun testReleaseCompilerAgainstPreReleaseLibrarySkipMetadataVersionCheck() {
         doTestPreReleaseKotlinLibrary(K2JVMCompiler(), "library", tmpdir, "-Xskip-metadata-version-check")