diff --git a/exercises/forth/build.sbt b/exercises/forth/build.sbt
index ab420e70..781e75e1 100644
--- a/exercises/forth/build.sbt
+++ b/exercises/forth/build.sbt
@@ -1,5 +1,5 @@
-scalaVersion := "2.11.7"
+scalaVersion := "2.12.1"
 
 
-libraryDependencies += "org.scalatest" % "scalatest_2.11" % "2.2.5" % "test"
+libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.1" % "test"
 libraryDependencies += "org.scala-lang.modules" %% "scala-parser-combinators" % "1.0.4"
diff --git a/exercises/forth/src/main/scala/Forth.scala b/exercises/forth/src/main/scala/Forth.scala
new file mode 100644
index 00000000..43c35850
--- /dev/null
+++ b/exercises/forth/src/main/scala/Forth.scala
@@ -0,0 +1,6 @@
+import ForthError.ForthError
+
+
+class Forth extends ForthEvaluator {
+  def eval(text: String): Either[ForthError, ForthEvaluatorState] = ???
+}
\ No newline at end of file