diff --git a/build.sbt b/build.sbt
index 74134b7c..33c51ecb 100644
--- a/build.sbt
+++ b/build.sbt
@@ -21,7 +21,6 @@ val commonSettings = commonSmlBuildSettings ++ ossPublishSettings ++ Seq(
 )
 
 val commonJvmSettings = commonSettings ++ Seq(
-  scalacOptions ++= Seq("-target:jvm-1.8"),
   ideSkipProject := (scalaVersion.value != scala2_13),
   libraryDependencies ++= Seq(
     "org.scalatest" %% "scalatest" % scalaTestVersion % Test
diff --git a/core/src/main/scalanative/sttp/model/internal/idn/IdnApi.scala b/core/src/main/scalanative-2.12/sttp/model/internal/idn/IdnApi.scala
similarity index 100%
rename from core/src/main/scalanative/sttp/model/internal/idn/IdnApi.scala
rename to core/src/main/scalanative-2.12/sttp/model/internal/idn/IdnApi.scala
diff --git a/core/src/main/scalanative-2.13/sttp/model/internal/idn/IdnApi.scala b/core/src/main/scalanative-2.13/sttp/model/internal/idn/IdnApi.scala
new file mode 100644
index 00000000..8bb72d7a
--- /dev/null
+++ b/core/src/main/scalanative-2.13/sttp/model/internal/idn/IdnApi.scala
@@ -0,0 +1,21 @@
+package sttp.model.internal.idn
+
+import scala.scalanative.libc.stdlib.{malloc, free}
+import scala.scalanative.unsafe.{CString, Ptr, Zone, fromCString, sizeof, toCString}
+
+private[model] object IdnApi {
+  def toAscii(input: String): String =
+    Zone { implicit z =>
+      val output: Ptr[CString] = malloc(sizeof[CString]).asInstanceOf[Ptr[CString]]
+      val rc = CIdn.toAscii(toCString(input), output, 0)
+      if (rc != 0) {
+        val errMsg = CIdn.errorMsg(rc)
+        throw new RuntimeException(fromCString(errMsg))
+      } else {
+        val out = fromCString(!output)
+        CIdn.free(!output)
+        free(output.asInstanceOf[Ptr[Byte]])
+        out
+      }
+    }
+}
diff --git a/core/src/main/scalanative-3/sttp/model/internal/idn/IdnApi.scala b/core/src/main/scalanative-3/sttp/model/internal/idn/IdnApi.scala
new file mode 100644
index 00000000..d1db1836
--- /dev/null
+++ b/core/src/main/scalanative-3/sttp/model/internal/idn/IdnApi.scala
@@ -0,0 +1,21 @@
+package sttp.model.internal.idn
+
+import scala.scalanative.libc.stdlib.{malloc, free}
+import scala.scalanative.unsafe.{CString, Ptr, Zone, fromCString, sizeof, toCString}
+
+private[model] object IdnApi {
+  def toAscii(input: String): String =
+    Zone { 
+      val output: Ptr[CString] = malloc(sizeof[CString]).asInstanceOf[Ptr[CString]]
+      val rc = CIdn.toAscii(toCString(input), output, 0)
+      if (rc != 0) {
+        val errMsg = CIdn.errorMsg(rc)
+        throw new RuntimeException(fromCString(errMsg))
+      } else {
+        val out = fromCString(!output)
+        CIdn.free(!output)
+        free(output.asInstanceOf[Ptr[Byte]])
+        out
+      }
+    }
+}
diff --git a/project/plugins.sbt b/project/plugins.sbt
index c05dd569..21b50e42 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1,6 +1,6 @@
 libraryDependencies += "org.scala-js" %% "scalajs-env-selenium" % "1.1.1"
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.16.0")
-addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.17")
+addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.5.1")
 addSbtPlugin("com.eed3si9n" % "sbt-projectmatrix" % "0.10.0")
 
 val sbtSoftwareMillVersion = "2.0.20"