diff --git a/src/main/kotlin/space/kscience/gradle/internal/common.kt b/src/main/kotlin/space/kscience/gradle/internal/common.kt
index 46b1474..8013390 100644
--- a/src/main/kotlin/space/kscience/gradle/internal/common.kt
+++ b/src/main/kotlin/space/kscience/gradle/internal/common.kt
@@ -30,9 +30,11 @@ internal fun LanguageSettingsBuilder.applySettings(
 
 
     optIn("kotlin.RequiresOptIn")
+    optIn("kotlin.ExperimentalUnsignedTypes")
     optIn("kotlin.ExperimentalStdlibApi")
     optIn("kotlin.time.ExperimentalTime")
     optIn("kotlin.contracts.ExperimentalContracts")
+    optIn("kotlin.js.ExperimentalJsExport")
 }
 
 internal fun Copy.fromJsDependencies(configurationName: String) = project.run {