diff --git a/client/shared/src/main/scala/org/scalaexercises/evaluator/EvaluatorClient.scala b/client/shared/src/main/scala/org/scalaexercises/evaluator/EvaluatorClient.scala
index 6df3bef5..10b2374d 100644
--- a/client/shared/src/main/scala/org/scalaexercises/evaluator/EvaluatorClient.scala
+++ b/client/shared/src/main/scala/org/scalaexercises/evaluator/EvaluatorClient.scala
@@ -5,9 +5,9 @@
 
 package org.scalaexercises.evaluator
 
-import cats.data.XorT
+import cats.data.EitherT
 import cats.~>
-import cats._, cats.std.all._
+import cats.implicits._
 import org.scalaexercises.evaluator.EvaluatorResponses.{EvalIO, EvaluationException, EvaluationResponse, EvaluationResult}
 import org.scalaexercises.evaluator.free.algebra.EvaluatorOp
 
@@ -25,15 +25,17 @@ object EvaluatorClient {
   def apply(url: String, authKey: String) =
     new EvaluatorClient(url, authKey)
 
-  implicit class EvaluationIOSyntaxXOR[A](
+  implicit class EvaluationIOSyntaxEither[A](
     evalIO: EvalIO[EvaluationResponse[A]]) {
 
     def exec(
       implicit I: (EvaluatorOp ~> Future)): Future[EvaluationResponse[A]] =
       evalIO foldMap I
 
-    def liftEvaluator: XorT[EvalIO, EvaluationException, EvaluationResult[A]] =
-      XorT[EvalIO, EvaluationException, EvaluationResult[A]](evalIO)
+    def liftEvaluator: EitherT[EvalIO,
+                               EvaluationException,
+                               EvaluationResult[A]] =
+      EitherT[EvalIO, EvaluationException, EvaluationResult[A]](evalIO)
 
   }
 }
diff --git a/client/shared/src/main/scala/org/scalaexercises/evaluator/EvaluatorResponses.scala b/client/shared/src/main/scala/org/scalaexercises/evaluator/EvaluatorResponses.scala
index 8a4ebfd3..666e0cfe 100644
--- a/client/shared/src/main/scala/org/scalaexercises/evaluator/EvaluatorResponses.scala
+++ b/client/shared/src/main/scala/org/scalaexercises/evaluator/EvaluatorResponses.scala
@@ -7,7 +7,7 @@ package org.scalaexercises.evaluator
 
 import cats.data.Xor
 import cats.free.Free
-import cats.syntax.xor._
+import cats.implicits._
 import io.circe.Decoder
 import io.circe.parser._
 import io.circe.generic.auto._
@@ -23,7 +23,7 @@ object EvaluatorResponses {
 
   type EvalIO[A] = Free[EvaluatorOp, A]
 
-  type EvaluationResponse[A] = EvaluationException Xor EvaluationResult[A]
+  type EvaluationResponse[A] = Either[EvaluationException, EvaluationResult[A]]
 
   case class EvaluationResult[A](result: A,
                                  statusCode: Int,
@@ -44,18 +44,17 @@ object EvaluatorResponses {
     implicit D: Decoder[A]): Future[EvaluationResponse[A]] =
     futureResponse map {
       case r if isSuccess(r.statusCode) ⇒
-        decode[A](r.body).fold(
-          e ⇒
-            JsonParsingException(e.getMessage, r.body)
-              .left[EvaluationResult[A]],
-          result ⇒
-            Xor.Right(
+        decode[A](r.body) match {
+          case Xor.Left(e) =>
+            Either.left(JsonParsingException(e.getMessage, r.body))
+          case Xor.Right(result) =>
+            Either.right(
               EvaluationResult(result, r.statusCode, r.headers.toLowerCase))
-        )
+        }
       case r ⇒
-        UnexpectedException(
-          s"Failed invoking get with status : ${r.statusCode}, body : \n ${r.body}")
-          .left[EvaluationResult[A]]
+        Either.left(
+          UnexpectedException(
+            s"Failed i(nvoking get with status : ${r.statusCode}, body : \n ${r.body}"))
     }
 
   private[this] def isSuccess(statusCode: Int) =
diff --git a/project/EvaluatorBuild.scala b/project/EvaluatorBuild.scala
index bcd65353..32f196ef 100644
--- a/project/EvaluatorBuild.scala
+++ b/project/EvaluatorBuild.scala
@@ -15,14 +15,14 @@ object EvaluatorBuild extends AutoPlugin {
   object autoImport {
 
     val v = Map(
-      'cats -> "0.6.1",
-      'circe -> "0.5.0-M2",
+      'cats -> "0.7.2",
+      'circe -> "0.5.2",
       'config -> "1.3.0",
       'coursier -> "1.0.0-M12",
-      'http4s -> "0.14.1",
+      'http4s -> "0.14.8",
       'jwtcore -> "0.8.0",
       'log4s -> "1.3.0",
-      'monix -> "2.0-RC8",
+      'monix -> "2.0.3",
       'roshttp -> "1.1.0",
       'scalacheck -> "1.12.5",
       'scalaTest -> "2.2.6",
@@ -50,7 +50,7 @@ object EvaluatorBuild extends AutoPlugin {
 
 
   private[this] def baseSettings = Seq(
-    version := "0.1.0-SNAPSHOT",
+    version := "0.1.1-SNAPSHOT",
     organization := "org.scala-exercises",
     scalaVersion := "2.11.8",
     scalafmtConfig in ThisBuild := Some(file(".scalafmt")),
diff --git a/server/src/main/scala/org/scalaexercises/evaluator/evaluation.scala b/server/src/main/scala/org/scalaexercises/evaluator/evaluation.scala
index 63bbe528..9c73411e 100644
--- a/server/src/main/scala/org/scalaexercises/evaluator/evaluation.scala
+++ b/server/src/main/scala/org/scalaexercises/evaluator/evaluation.scala
@@ -183,7 +183,7 @@ private class StringCompiler(
       }
       messages += (severityName + lineMessage + ": " + message) ::
         (if (pos.isDefined) {
-           pos.inUltimateSource(pos.source).lineContent.stripLineEnd ::
+           pos.finalPosition.lineContent.stripLineEnd ::
              (" " * (pos.column - 1) + "^") ::
                Nil
          } else {