diff --git a/core/reflection.jvm/src/kotlin/reflect/full/KAnnotatedElements.kt b/core/reflection.jvm/src/kotlin/reflect/full/KAnnotatedElements.kt
index 659d40a1b13..5d519e4410b 100644
--- a/core/reflection.jvm/src/kotlin/reflect/full/KAnnotatedElements.kt
+++ b/core/reflection.jvm/src/kotlin/reflect/full/KAnnotatedElements.kt
@@ -20,7 +20,8 @@ inline fun <reified T : Annotation> KAnnotatedElement.findAnnotation(): T? =
 /**
  * Returns true if this element is annotated with an annotation of type [T].
  */
-@ExperimentalStdlibApi
-@SinceKotlin("1.3")
+@SinceKotlin("1.4")
+@Suppress("INVISIBLE_MEMBER", "INVISIBLE_REFERENCE")
+@WasExperimental(ExperimentalStdlibApi::class)
 inline fun <reified T : Annotation> KAnnotatedElement.hasAnnotation(): Boolean =
     findAnnotation<T>() != null
diff --git a/libraries/stdlib/src/kotlin/reflect/KClasses.kt b/libraries/stdlib/src/kotlin/reflect/KClasses.kt
index 92097bd51a1..edd67db15b8 100644
--- a/libraries/stdlib/src/kotlin/reflect/KClasses.kt
+++ b/libraries/stdlib/src/kotlin/reflect/KClasses.kt
@@ -19,8 +19,8 @@ import kotlin.internal.LowPriorityInOverloadResolution
  * @see [KClass.isInstance]
  * @see [KClass.safeCast]
  */
-@SinceKotlin("1.3")
-@ExperimentalStdlibApi
+@SinceKotlin("1.4")
+@WasExperimental(ExperimentalStdlibApi::class)
 @LowPriorityInOverloadResolution
 fun <T : Any> KClass<T>.cast(value: Any?): T {
     if (!isInstance(value)) throw ClassCastException("Value cannot be cast to $qualifiedOrSimpleName")
@@ -39,8 +39,8 @@ internal expect val KClass<*>.qualifiedOrSimpleName: String?
  * @see [KClass.isInstance]
  * @see [KClass.cast]
  */
-@SinceKotlin("1.3")
-@ExperimentalStdlibApi
+@SinceKotlin("1.4")
+@WasExperimental(ExperimentalStdlibApi::class)
 @LowPriorityInOverloadResolution
 fun <T : Any> KClass<T>.safeCast(value: Any?): T? {
     return if (isInstance(value)) value as T else null