diff --git a/compiler/testData/codegen/box/unit/kt51036.kt b/compiler/testData/codegen/box/unit/kt51036.kt
index 3fdd774ec2f..be87f454a37 100644
--- a/compiler/testData/codegen/box/unit/kt51036.kt
+++ b/compiler/testData/codegen/box/unit/kt51036.kt
@@ -12,5 +12,6 @@ fun box(): String {
 class A {
     companion object;
     operator fun String.invoke() = Unit
+    @Suppress("DEPRECATION_ERROR")
     fun close() = synchronized(this) { "abc" }()
 }
diff --git a/compiler/testData/ir/irText/expressions/kt51036.fir.ir.txt b/compiler/testData/ir/irText/expressions/kt51036.fir.ir.txt
index a34f8daaf88..ed71ff0de06 100644
--- a/compiler/testData/ir/irText/expressions/kt51036.fir.ir.txt
+++ b/compiler/testData/ir/irText/expressions/kt51036.fir.ir.txt
@@ -31,6 +31,8 @@ FILE fqName:<root> fileName:/kt51036.kt
         RETURN type=kotlin.Nothing from='public final fun invoke (): kotlin.Unit [operator] declared in <root>.A'
           GET_OBJECT 'CLASS IR_EXTERNAL_DECLARATION_STUB OBJECT name:Unit modality:FINAL visibility:public superTypes:[kotlin.Any]' type=kotlin.Unit
     FUN name:close visibility:public modality:FINAL <> ($this:<root>.A) returnType:kotlin.Unit
+      annotations:
+        Suppress(names = ['DEPRECATION_ERROR'])
       $this: VALUE_PARAMETER name:<this> type:<root>.A
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public final fun close (): kotlin.Unit declared in <root>.A'
diff --git a/compiler/testData/ir/irText/expressions/kt51036.ir.txt b/compiler/testData/ir/irText/expressions/kt51036.ir.txt
index 0e04f54425e..f6c6884b174 100644
--- a/compiler/testData/ir/irText/expressions/kt51036.ir.txt
+++ b/compiler/testData/ir/irText/expressions/kt51036.ir.txt
@@ -31,6 +31,8 @@ FILE fqName:<root> fileName:/kt51036.kt
         RETURN type=kotlin.Nothing from='public final fun invoke (): kotlin.Unit [operator] declared in <root>.A'
           GET_OBJECT 'CLASS IR_EXTERNAL_DECLARATION_STUB OBJECT name:Unit modality:FINAL visibility:public superTypes:[kotlin.Any]' type=kotlin.Unit
     FUN name:close visibility:public modality:FINAL <> ($this:<root>.A) returnType:kotlin.Unit
+      annotations:
+        Suppress(names = ['DEPRECATION_ERROR'])
       $this: VALUE_PARAMETER name:<this> type:<root>.A
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public final fun close (): kotlin.Unit declared in <root>.A'
diff --git a/compiler/testData/ir/irText/expressions/kt51036.kt b/compiler/testData/ir/irText/expressions/kt51036.kt
index 65e7a58f288..5e68c1acce5 100644
--- a/compiler/testData/ir/irText/expressions/kt51036.kt
+++ b/compiler/testData/ir/irText/expressions/kt51036.kt
@@ -6,5 +6,6 @@
 class A {
     companion object;
     operator fun String.invoke() = Unit
+    @Suppress("DEPRECATION_ERROR")
     fun close() = synchronized(this) { "Abc" }()
 }
diff --git a/libraries/stdlib/api/js-v1/kotlin.kt b/libraries/stdlib/api/js-v1/kotlin.kt
index 27f048496e9..de2ab322359 100644
--- a/libraries/stdlib/api/js-v1/kotlin.kt
+++ b/libraries/stdlib/api/js-v1/kotlin.kt
@@ -156,7 +156,7 @@ public inline fun <R> runCatching(block: () -> R): kotlin.Result<R>
 @kotlin.SinceKotlin(version = "1.2")
 public inline fun <R> suspend(noinline block: suspend () -> R): suspend () -> R
 
-@kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.9", warningSince = "1.6")
 @kotlin.Deprecated(message = "Synchronization on any object is not supported in Kotlin/JS", replaceWith = kotlin.ReplaceWith(expression = "run(block)", imports = {}))
 @kotlin.internal.InlineOnly
 public inline fun <R> synchronized(lock: kotlin.Any, block: () -> R): R
diff --git a/libraries/stdlib/api/js/kotlin.kt b/libraries/stdlib/api/js/kotlin.kt
index 912008eee49..0b9850506a7 100644
--- a/libraries/stdlib/api/js/kotlin.kt
+++ b/libraries/stdlib/api/js/kotlin.kt
@@ -120,7 +120,7 @@ public inline fun <R> runCatching(block: () -> R): kotlin.Result<R>
 @kotlin.SinceKotlin(version = "1.2")
 public inline fun <R> suspend(noinline block: suspend () -> R): suspend () -> R
 
-@kotlin.DeprecatedSinceKotlin(warningSince = "1.6")
+@kotlin.DeprecatedSinceKotlin(errorSince = "1.9", warningSince = "1.6")
 @kotlin.Deprecated(message = "Synchronization on any object is not supported in Kotlin/JS", replaceWith = kotlin.ReplaceWith(expression = "run(block)", imports = {}))
 @kotlin.internal.InlineOnly
 public inline fun <R> synchronized(lock: kotlin.Any, block: () -> R): R
diff --git a/libraries/stdlib/js/src/kotlin/concurrent.kt b/libraries/stdlib/js/src/kotlin/concurrent.kt
index 6c265e09579..2d19d1aa381 100644
--- a/libraries/stdlib/js/src/kotlin/concurrent.kt
+++ b/libraries/stdlib/js/src/kotlin/concurrent.kt
@@ -8,7 +8,7 @@ package kotlin
 import kotlin.contracts.*
 
 
-@DeprecatedSinceKotlin(warningSince = "1.6")
+@DeprecatedSinceKotlin(warningSince = "1.6", errorSince = "1.9")
 @Deprecated("Synchronization on any object is not supported in Kotlin/JS", ReplaceWith("run(block)"))
 @kotlin.internal.InlineOnly
 @Suppress("UNUSED_PARAMETER")