diff --git a/build.sbt b/build.sbt
index 4e82b1d5a..ddda94edf 100644
--- a/build.sbt
+++ b/build.sbt
@@ -3,7 +3,7 @@ organization := "com.github.sbt"
 homepage := Some(url("https://github.com/sbt/sbt-native-packager"))
 
 Global / onChangedBuildSource := ReloadOnSourceChanges
-Global / scalaVersion := "2.12.19"
+Global / scalaVersion := "2.13.13"
 
 // crossBuildingSettings
 crossSbtVersions := Vector("1.1.6")
diff --git a/src/main/scala/com/typesafe/sbt/packager/linux/LinuxPackageMapping.scala b/src/main/scala/com/typesafe/sbt/packager/linux/LinuxPackageMapping.scala
index 4f66e0545..6f9b6a95c 100644
--- a/src/main/scala/com/typesafe/sbt/packager/linux/LinuxPackageMapping.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/linux/LinuxPackageMapping.scala
@@ -4,6 +4,7 @@ package linux
 
 import sbt._
 import LinuxPlugin.Users
+import scala.Iterable
 
 case class LinuxFileMetaData(
   user: String = Users.Root,
@@ -21,7 +22,7 @@ case class LinuxFileMetaData(
 }
 
 case class LinuxPackageMapping(
-  mappings: Traversable[(File, String)],
+  mappings: Iterable[(File, String)],
   fileData: LinuxFileMetaData = LinuxFileMetaData(),
   zipped: Boolean = false
 ) {
diff --git a/src/main/scala/com/typesafe/sbt/packager/universal/ZipHelper.scala b/src/main/scala/com/typesafe/sbt/packager/universal/ZipHelper.scala
index b2a6a3230..c5deac427 100644
--- a/src/main/scala/com/typesafe/sbt/packager/universal/ZipHelper.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/universal/ZipHelper.scala
@@ -11,6 +11,7 @@ import org.apache.commons.compress.utils.IOUtils
 import sbt._
 
 import scala.collection.JavaConverters._
+import scala.Iterable
 
 /**
   * Module with functions associated with processing zip files.
@@ -34,7 +35,7 @@ object ZipHelper {
     * @param outputZip
     *   The location of the output file.
     */
-  def zipNative(sources: Traversable[(File, String)], outputZip: File): Unit =
+  def zipNative(sources: Iterable[(File, String)], outputZip: File): Unit =
     IO.withTemporaryDirectory { dir =>
       val name = outputZip.getName
       val zipDir = dir / (if (name endsWith ".zip") name dropRight 4 else name)
@@ -69,7 +70,7 @@ object ZipHelper {
     * @param outputZip
     *   The location of the output file.
     */
-  def zip(sources: Traversable[(File, String)], outputZip: File): Unit = {
+  def zip(sources: Iterable[(File, String)], outputZip: File): Unit = {
     import permissions.OctalString
     val mappings =
       for {
@@ -90,7 +91,7 @@ object ZipHelper {
     * @param outputZip
     *   The location of the output file.
     */
-  def zipNIO(sources: Traversable[(File, String)], outputZip: File): Unit = {
+  def zipNIO(sources: Iterable[(File, String)], outputZip: File): Unit = {
     require(!outputZip.isDirectory, "Specified output file " + outputZip + " is a directory.")
     val mappings = sources.toSeq.map { case (file, name) =>
       FileMapping(file, name)
diff --git a/src/test/scala/com/typesafe/sbt/packager/universal/ZipHelperSpec.scala b/src/test/scala/com/typesafe/sbt/packager/universal/ZipHelperSpec.scala
index 97e8d9ade..64a9efc2a 100644
--- a/src/test/scala/com/typesafe/sbt/packager/universal/ZipHelperSpec.scala
+++ b/src/test/scala/com/typesafe/sbt/packager/universal/ZipHelperSpec.scala
@@ -6,7 +6,8 @@ import org.scalatest._
 import java.io.File
 import java.nio.file.{Files, Path, Paths}
 import java.nio.file.attribute.PosixFilePermission._
-import scala.collection.JavaConversions._
+import scala.Iterable
+import scala.collection.JavaConverters._
 
 class ZipHelperSpec extends WordSpec with Matchers with BeforeAndAfterEach with BeforeAndAfterAll {
 
@@ -100,7 +101,7 @@ class ZipHelperSpec extends WordSpec with Matchers with BeforeAndAfterEach with
   /* ========================================================== */
   /* ========================================================== */
 
-  private type Zipper = (Traversable[(File, String)], File) => Unit
+  private type Zipper = (Iterable[(File, String)], File) => Unit
 
   private def zipSingleFile(zipper: Zipper): Unit = {
     val out = tmp resolve "single.zip"