diff --git a/unit2/lesson13/build.sbt b/unit2/lesson13/build.sbt
index 5c29a38b..52811039 100644
--- a/unit2/lesson13/build.sbt
+++ b/unit2/lesson13/build.sbt
@@ -2,4 +2,4 @@ name := "get-programming-with-scala-lesson13"
 
 version := "0.1"
 
-scalaVersion := "2.12.6"
\ No newline at end of file
+scalaVersion := "3.0.0-M1"
diff --git a/unit2/lesson13/project/plugins.sbt b/unit2/lesson13/project/plugins.sbt
new file mode 100644
index 00000000..04f707be
--- /dev/null
+++ b/unit2/lesson13/project/plugins.sbt
@@ -0,0 +1 @@
+addSbtPlugin("ch.epfl.lamp" % "sbt-dotty" % "0.4.5")