diff --git a/kotlin-native/Interop/JsRuntime/src/main/kotlin/jsinterop.kt b/kotlin-native/Interop/JsRuntime/src/main/kotlin/jsinterop.kt
index 3c271ef4793..894493191c1 100644
--- a/kotlin-native/Interop/JsRuntime/src/main/kotlin/jsinterop.kt
+++ b/kotlin-native/Interop/JsRuntime/src/main/kotlin/jsinterop.kt
@@ -139,5 +139,7 @@ fun JsValue.setter(property: String, string: String) {
 
 object ArenaManager {
     val globalArena = allocateArena()
+
+    @Suppress("VARIABLE_IN_SINGLETON_WITHOUT_THREAD_LOCAL")
     var currentArena = globalArena
-}
\ No newline at end of file
+}
diff --git a/kotlin-native/Interop/Runtime/build.gradle.kts b/kotlin-native/Interop/Runtime/build.gradle.kts
index 6132d96490a..45c6a9d5ab5 100644
--- a/kotlin-native/Interop/Runtime/build.gradle.kts
+++ b/kotlin-native/Interop/Runtime/build.gradle.kts
@@ -78,7 +78,7 @@ tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach
         freeCompilerArgs = listOf("-Xuse-experimental=kotlin.ExperimentalUnsignedTypes",
                                   "-Xuse-experimental=kotlin.Experimental",
                                   "-Xopt-in=kotlin.RequiresOptIn",
-                                  "-XXLanguage:+InlineClasses",
+                                  "-Xinline-classes",
                                   "-Xskip-prerelease-check")
         allWarningsAsErrors = true
     }
diff --git a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeTypes.kt b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeTypes.kt
index b7feb4f7359..34267719d4e 100644
--- a/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeTypes.kt
+++ b/kotlin-native/Interop/Runtime/src/native/kotlin/kotlinx/cinterop/NativeTypes.kt
@@ -58,6 +58,7 @@ external fun CPointer<*>.getRawValue(): NativePtr
 
 internal fun CPointer<*>.cPointerToString() = "CPointer(raw=$rawValue)"
 
+@Suppress("FINAL_UPPER_BOUND")
 public class Vector128VarOf<T : Vector128>(rawPtr: NativePtr) : CVariable(rawPtr) {
     @Deprecated("Use sizeOf<T>() or alignOf<T>() instead.")
     @Suppress("DEPRECATION")
@@ -66,6 +67,7 @@ public class Vector128VarOf<T : Vector128>(rawPtr: NativePtr) : CVariable(rawPtr
 
 public typealias Vector128Var = Vector128VarOf<Vector128>
 
+@Suppress("FINAL_UPPER_BOUND", "UNCHECKED_CAST")
 public var <T : Vector128> Vector128VarOf<T>.value: T
     get() = nativeMemUtils.getVector(this) as T
     set(value) = nativeMemUtils.putVector(this, value)
diff --git a/kotlin-native/backend.native/build.gradle b/kotlin-native/backend.native/build.gradle
index ede4bda0893..4eef8744483 100644
--- a/kotlin-native/backend.native/build.gradle
+++ b/kotlin-native/backend.native/build.gradle
@@ -252,7 +252,7 @@ targetList.each { target ->
         def testCommon = project(":kotlin-test:kotlin-test-common").files("src/main/kotlin").files
         args = [*konanArgs,
                 '-output', project(':kotlin-native:runtime').file("build/${target}Stdlib"),
-                '-produce', 'library', '-module-name', 'stdlib', '-XXLanguage:+AllowContractsForCustomFunctions',
+                '-produce', 'library', '-module-name', 'stdlib',
                 '-Xmulti-platform', '-Xopt-in=kotlin.RequiresOptIn', '-Xinline-classes',
                 '-Xopt-in=kotlin.contracts.ExperimentalContracts',
                 '-Xopt-in=kotlin.ExperimentalMultiplatform',
@@ -358,4 +358,4 @@ publishing {
             from components.java
         }
     }
-}
\ No newline at end of file
+}
diff --git a/kotlin-native/endorsedLibraries/kotlinx.cli/build.gradle b/kotlin-native/endorsedLibraries/kotlinx.cli/build.gradle
index 7145aa0b3da..48d0e11e6fb 100644
--- a/kotlin-native/endorsedLibraries/kotlinx.cli/build.gradle
+++ b/kotlin-native/endorsedLibraries/kotlinx.cli/build.gradle
@@ -93,7 +93,7 @@ targetList.each { target ->
         jvmArgs = konanJvmArgs
         args = [*konanArgs,
                 '-output', outputFile,
-                '-produce', 'library', '-module-name', moduleName, '-XXLanguage:+AllowContractsForCustomFunctions',
+                '-produce', 'library', '-module-name', moduleName,
                 '-Xmulti-platform', '-Xopt-in=kotlinx.cli.ExperimentalCli',
                 '-Xopt-in=kotlin.ExperimentalMultiplatform',
                 '-Xallow-result-return-type',  '-Werror', '-Xopt-in=kotlin.RequiresOptIn',