diff --git a/compiler/testData/experimental/jsExperimentalModule/output.txt b/compiler/testData/experimental/jsExperimentalModule/output.txt
index 0ceee7a6fce..09053fceb69 100644
--- a/compiler/testData/experimental/jsExperimentalModule/output.txt
+++ b/compiler/testData/experimental/jsExperimentalModule/output.txt
@@ -1,7 +1,7 @@
-compiler/testData/experimental/jsExperimentalModule/usage.kt:5:15: error: this declaration is experimental and its usage must be marked with '@lib.ExperimentalAPI' or '@UseExperimental(lib.ExperimentalAPI::class)'
+compiler/testData/experimental/jsExperimentalModule/usage.kt:5:15: error: this declaration is experimental and its usage must be marked with '@lib.ExperimentalAPI' or '@OptIn(lib.ExperimentalAPI::class)'
 fun fail(foo: Foo) {
               ^
-compiler/testData/experimental/jsExperimentalModule/usage.kt:6:5: error: this declaration is experimental and its usage must be marked with '@lib.ExperimentalAPI' or '@UseExperimental(lib.ExperimentalAPI::class)'
+compiler/testData/experimental/jsExperimentalModule/usage.kt:6:5: error: this declaration is experimental and its usage must be marked with '@lib.ExperimentalAPI' or '@OptIn(lib.ExperimentalAPI::class)'
     bar()
     ^
 COMPILATION_ERROR
diff --git a/compiler/testData/experimental/jvmExperimentalModule/output.txt b/compiler/testData/experimental/jvmExperimentalModule/output.txt
index 80c78afe57d..c835c1f29c7 100644
--- a/compiler/testData/experimental/jvmExperimentalModule/output.txt
+++ b/compiler/testData/experimental/jvmExperimentalModule/output.txt
@@ -1,7 +1,7 @@
-compiler/testData/experimental/jvmExperimentalModule/usage.kt:5:15: error: this declaration is experimental and its usage must be marked with '@lib.ExperimentalAPI' or '@UseExperimental(lib.ExperimentalAPI::class)'
+compiler/testData/experimental/jvmExperimentalModule/usage.kt:5:15: error: this declaration is experimental and its usage must be marked with '@lib.ExperimentalAPI' or '@OptIn(lib.ExperimentalAPI::class)'
 fun fail(foo: Foo) {
               ^
-compiler/testData/experimental/jvmExperimentalModule/usage.kt:6:5: error: this declaration is experimental and its usage must be marked with '@lib.ExperimentalAPI' or '@UseExperimental(lib.ExperimentalAPI::class)'
+compiler/testData/experimental/jvmExperimentalModule/usage.kt:6:5: error: this declaration is experimental and its usage must be marked with '@lib.ExperimentalAPI' or '@OptIn(lib.ExperimentalAPI::class)'
     bar()
     ^
 COMPILATION_ERROR
diff --git a/idea/testData/quickfix/experimental/basicFunctionNotApplicable.kt b/idea/testData/quickfix/experimental/basicFunctionNotApplicable.kt
index 488f55d3b29..d075fd675dd 100644
--- a/idea/testData/quickfix/experimental/basicFunctionNotApplicable.kt
+++ b/idea/testData/quickfix/experimental/basicFunctionNotApplicable.kt
@@ -2,10 +2,10 @@
 // COMPILER_ARGUMENTS: -Xuse-experimental=kotlin.Experimental
 // WITH_RUNTIME
 // ACTION: Add '@MyExperimentalAPI' annotation to containing class 'Bar'
-// ACTION: Add '@UseExperimental(MyExperimentalAPI::class)' annotation to 'bar'
+// ACTION: Add '@OptIn(MyExperimentalAPI::class)' annotation to 'bar'
 // ACTION: Add '-Xuse-experimental=MyExperimentalAPI' to module light_idea_test_case compiler arguments
-// ERROR: This declaration is experimental and its usage must be marked with '@MyExperimentalAPI' or '@UseExperimental(MyExperimentalAPI::class)'
-// ERROR: This declaration is experimental and its usage must be marked with '@MyExperimentalAPI' or '@UseExperimental(MyExperimentalAPI::class)'
+// ERROR: This declaration is experimental and its usage must be marked with '@MyExperimentalAPI' or '@OptIn(MyExperimentalAPI::class)'
+// ERROR: This declaration is experimental and its usage must be marked with '@MyExperimentalAPI' or '@OptIn(MyExperimentalAPI::class)'
 
 @Experimental
 @Target(AnnotationTarget.CLASS)
@@ -20,4 +20,4 @@ class Bar {
     fun bar() {
         Some().foo<caret>()
     }
-}
\ No newline at end of file
+}
diff --git a/idea/testData/quickfix/experimental/basicUseExperimental.kt b/idea/testData/quickfix/experimental/basicUseExperimental.kt
index 23cd4c4838d..f03a2b7316d 100644
--- a/idea/testData/quickfix/experimental/basicUseExperimental.kt
+++ b/idea/testData/quickfix/experimental/basicUseExperimental.kt
@@ -1,4 +1,4 @@
-// "Add '@UseExperimental(MyExperimentalAPI::class)' annotation to 'bar'" "true"
+// "Add '@OptIn(MyExperimentalAPI::class)' annotation to 'bar'" "true"
 // COMPILER_ARGUMENTS: -Xuse-experimental=kotlin.Experimental
 // WITH_RUNTIME
 
@@ -17,4 +17,4 @@ class Bar {
     fun bar() {
         Some().foo<caret>()
     }
-}
\ No newline at end of file
+}
diff --git a/idea/testData/quickfix/experimental/basicUseExperimental.kt.after b/idea/testData/quickfix/experimental/basicUseExperimental.kt.after
index 4ddddedf975..900a98825cd 100644
--- a/idea/testData/quickfix/experimental/basicUseExperimental.kt.after
+++ b/idea/testData/quickfix/experimental/basicUseExperimental.kt.after
@@ -1,4 +1,4 @@
-// "Add '@UseExperimental(MyExperimentalAPI::class)' annotation to 'bar'" "true"
+// "Add '@OptIn(MyExperimentalAPI::class)' annotation to 'bar'" "true"
 // COMPILER_ARGUMENTS: -Xuse-experimental=kotlin.Experimental
 // WITH_RUNTIME
 
@@ -14,8 +14,8 @@ class Some {
 }
 
 class Bar {
-    @UseExperimental(MyExperimentalAPI::class)
+    @OptIn(MyExperimentalAPI::class)
     fun bar() {
         Some().foo()
     }
-}
\ No newline at end of file
+}
diff --git a/idea/testData/quickfix/experimental/classUseExperimental.kt b/idea/testData/quickfix/experimental/classUseExperimental.kt
index 8be0c6e3b0c..1c45438fbe2 100644
--- a/idea/testData/quickfix/experimental/classUseExperimental.kt
+++ b/idea/testData/quickfix/experimental/classUseExperimental.kt
@@ -1,4 +1,4 @@
-// "Add '@UseExperimental(MyExperimentalAPI::class)' annotation to containing class 'Bar'" "true"
+// "Add '@OptIn(MyExperimentalAPI::class)' annotation to containing class 'Bar'" "true"
 // COMPILER_ARGUMENTS: -Xuse-experimental=kotlin.Experimental
 // WITH_RUNTIME
 
@@ -15,4 +15,4 @@ class Bar {
     fun bar() {
         foo<caret>()
     }
-}
\ No newline at end of file
+}
diff --git a/idea/testData/quickfix/experimental/classUseExperimental.kt.after b/idea/testData/quickfix/experimental/classUseExperimental.kt.after
index 217c445c4cb..cae5389ad7d 100644
--- a/idea/testData/quickfix/experimental/classUseExperimental.kt.after
+++ b/idea/testData/quickfix/experimental/classUseExperimental.kt.after
@@ -1,4 +1,4 @@
-// "Add '@UseExperimental(MyExperimentalAPI::class)' annotation to containing class 'Bar'" "true"
+// "Add '@OptIn(MyExperimentalAPI::class)' annotation to containing class 'Bar'" "true"
 // COMPILER_ARGUMENTS: -Xuse-experimental=kotlin.Experimental
 // WITH_RUNTIME
 
@@ -11,9 +11,9 @@ annotation class MyExperimentalAPI
 @MyExperimentalAPI
 fun foo() {}
 
-@UseExperimental(MyExperimentalAPI::class)
+@OptIn(MyExperimentalAPI::class)
 class Bar {
     fun bar() {
         foo()
     }
-}
\ No newline at end of file
+}
diff --git a/idea/testData/quickfix/experimental/nestedClasses.kt b/idea/testData/quickfix/experimental/nestedClasses.kt
index 1f99d772513..ca02eed0590 100644
--- a/idea/testData/quickfix/experimental/nestedClasses.kt
+++ b/idea/testData/quickfix/experimental/nestedClasses.kt
@@ -3,10 +3,10 @@
 // WITH_RUNTIME
 // ACTION: Add '@MyExperimentalAPI' annotation to 'bar'
 // ACTION: Add '@MyExperimentalAPI' annotation to containing class 'Inner'
-// ACTION: Add '@UseExperimental(MyExperimentalAPI::class)' annotation to 'bar'
+// ACTION: Add '@OptIn(MyExperimentalAPI::class)' annotation to 'bar'
 // ACTION: Add '-Xuse-experimental=MyExperimentalAPI' to module light_idea_test_case compiler arguments
 // ACTION: Introduce import alias
-// ERROR: This declaration is experimental and its usage must be marked with '@MyExperimentalAPI' or '@UseExperimental(MyExperimentalAPI::class)'
+// ERROR: This declaration is experimental and its usage must be marked with '@MyExperimentalAPI' or '@OptIn(MyExperimentalAPI::class)'
 
 @Experimental
 annotation class MyExperimentalAPI
@@ -22,4 +22,4 @@ class Outer {
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/idea/testData/quickfix/experimental/override.kt b/idea/testData/quickfix/experimental/override.kt
index 7f85a7faca5..9bab0d83464 100644
--- a/idea/testData/quickfix/experimental/override.kt
+++ b/idea/testData/quickfix/experimental/override.kt
@@ -2,8 +2,8 @@
 // COMPILER_ARGUMENTS: -Xuse-experimental=kotlin.Experimental
 // WITH_RUNTIME
 // ACTION: Add '@MyExperimentalAPI' annotation to 'foo'
-// ACTION: Add '@UseExperimental(MyExperimentalAPI::class)' annotation to 'foo'
-// ACTION: Add '@UseExperimental(MyExperimentalAPI::class)' annotation to containing class 'Derived'
+// ACTION: Add '@OptIn(MyExperimentalAPI::class)' annotation to 'foo'
+// ACTION: Add '@OptIn(MyExperimentalAPI::class)' annotation to containing class 'Derived'
 // ACTION: Add '-Xuse-experimental=MyExperimentalAPI' to module light_idea_test_case compiler arguments
 // ERROR: This declaration overrides experimental member of supertype 'Base' and must be annotated with '@MyExperimentalAPI'
 
@@ -18,4 +18,4 @@ open class Base {
 
 class Derived : Base() {
     override fun foo<caret>() {}
-}
\ No newline at end of file
+}
diff --git a/idea/testData/quickfix/experimental/switchOn.kt b/idea/testData/quickfix/experimental/switchOn.kt
index f8fa5eb86f4..e4488e252b9 100644
--- a/idea/testData/quickfix/experimental/switchOn.kt
+++ b/idea/testData/quickfix/experimental/switchOn.kt
@@ -1,8 +1,8 @@
-// "Add '-Xuse-experimental=kotlin.Experimental' to module light_idea_test_case compiler arguments" "true"
+// "Add '-Xuse-experimental=kotlin.RequiresOptIn' to module light_idea_test_case compiler arguments" "true"
 // COMPILER_ARGUMENTS: -version
-// COMPILER_ARGUMENTS_AFTER: -version -Xuse-experimental=kotlin.Experimental
+// COMPILER_ARGUMENTS_AFTER: -version -Xuse-experimental=kotlin.RequiresOptIn
 // DISABLE-ERRORS
 // WITH_RUNTIME
 
 @Experimental<caret>
-annotation class MyExperimentalAPI
\ No newline at end of file
+annotation class MyExperimentalAPI
diff --git a/idea/testData/quickfix/experimental/switchOn.kt.after b/idea/testData/quickfix/experimental/switchOn.kt.after
index c841c4a2906..79539d18ffb 100644
--- a/idea/testData/quickfix/experimental/switchOn.kt.after
+++ b/idea/testData/quickfix/experimental/switchOn.kt.after
@@ -1,8 +1,8 @@
-// "Add '-Xuse-experimental=kotlin.Experimental' to module light_idea_test_case compiler arguments" "true"
+// "Add '-Xuse-experimental=kotlin.RequiresOptIn' to module light_idea_test_case compiler arguments" "true"
 // COMPILER_ARGUMENTS: -version
-// COMPILER_ARGUMENTS_AFTER: -version -Xuse-experimental=kotlin.Experimental
+// COMPILER_ARGUMENTS_AFTER: -version -Xuse-experimental=kotlin.RequiresOptIn
 // DISABLE-ERRORS
 // WITH_RUNTIME
 
 @Experimental
-annotation class MyExperimentalAPI
\ No newline at end of file
+annotation class MyExperimentalAPI
diff --git a/idea/testData/quickfix/experimental/typeAlias.kt b/idea/testData/quickfix/experimental/typeAlias.kt
index c0cf890e5d3..52a3c8551ec 100644
--- a/idea/testData/quickfix/experimental/typeAlias.kt
+++ b/idea/testData/quickfix/experimental/typeAlias.kt
@@ -1,4 +1,4 @@
-// "Add '@UseExperimental(AliasMarker::class)' annotation to 'AliasMarkerUsage'" "true"
+// "Add '@OptIn(AliasMarker::class)' annotation to 'AliasMarkerUsage'" "true"
 // COMPILER_ARGUMENTS: -Xuse-experimental=kotlin.Experimental
 // WITH_RUNTIME
 // ACTION: Add '-Xuse-experimental=AliasMarker' to module light_idea_test_case compiler arguments
@@ -9,4 +9,4 @@ annotation class AliasMarker
 @AliasMarker
 class AliasTarget
 
-typealias AliasMarkerUsage = <caret>AliasTarget
\ No newline at end of file
+typealias AliasMarkerUsage = <caret>AliasTarget
diff --git a/idea/testData/quickfix/experimental/typeAlias.kt.after b/idea/testData/quickfix/experimental/typeAlias.kt.after
index 4e2dcc4c1d9..a59facd8d07 100644
--- a/idea/testData/quickfix/experimental/typeAlias.kt.after
+++ b/idea/testData/quickfix/experimental/typeAlias.kt.after
@@ -1,4 +1,4 @@
-// "Add '@UseExperimental(AliasMarker::class)' annotation to 'AliasMarkerUsage'" "true"
+// "Add '@OptIn(AliasMarker::class)' annotation to 'AliasMarkerUsage'" "true"
 // COMPILER_ARGUMENTS: -Xuse-experimental=kotlin.Experimental
 // WITH_RUNTIME
 // ACTION: Add '-Xuse-experimental=AliasMarker' to module light_idea_test_case compiler arguments
@@ -9,5 +9,5 @@ annotation class AliasMarker
 @AliasMarker
 class AliasTarget
 
-@UseExperimental(AliasMarker::class)
-typealias AliasMarkerUsage = AliasTarget
\ No newline at end of file
+@OptIn(AliasMarker::class)
+typealias AliasMarkerUsage = AliasTarget
diff --git a/libraries/tools/binary-compatibility-validator/reference-public-api/kotlin-stdlib-runtime-merged.txt b/libraries/tools/binary-compatibility-validator/reference-public-api/kotlin-stdlib-runtime-merged.txt
index 9c0fd8a730a..886a10b0a5c 100644
--- a/libraries/tools/binary-compatibility-validator/reference-public-api/kotlin-stdlib-runtime-merged.txt
+++ b/libraries/tools/binary-compatibility-validator/reference-public-api/kotlin-stdlib-runtime-merged.txt
@@ -126,6 +126,10 @@ public final class kotlin/NumbersKt {
 	public static final fun rotateRight (SI)S
 }
 
+public abstract interface annotation class kotlin/OptIn : java/lang/annotation/Annotation {
+	public abstract fun markerClass ()[Ljava/lang/Class;
+}
+
 public abstract interface annotation class kotlin/OptionalExpectation : java/lang/annotation/Annotation {
 }
 
@@ -154,6 +158,17 @@ public abstract interface annotation class kotlin/ReplaceWith : java/lang/annota
 	public abstract fun imports ()[Ljava/lang/String;
 }
 
+public abstract interface annotation class kotlin/RequiresOptIn : java/lang/annotation/Annotation {
+	public abstract fun level ()Lkotlin/RequiresOptIn$Level;
+}
+
+public final class kotlin/RequiresOptIn$Level : java/lang/Enum {
+	public static final field ERROR Lkotlin/RequiresOptIn$Level;
+	public static final field WARNING Lkotlin/RequiresOptIn$Level;
+	public static fun valueOf (Ljava/lang/String;)Lkotlin/RequiresOptIn$Level;
+	public static fun values ()[Lkotlin/RequiresOptIn$Level;
+}
+
 public final class kotlin/Result : java/io/Serializable {
 	public static final field Companion Lkotlin/Result$Companion;
 	public static final synthetic fun box-impl (Ljava/lang/Object;)Lkotlin/Result;