diff --git a/build.sbt b/build.sbt
index 5e74aa15e..5000fd925 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,7 +1,16 @@
 seq(lsSettings :_*)
 
-CrossBuilding.crossSbtVersions := Seq("0.11.1", "0.11.2", "0.11.3", "0.12")
+crossBuildingSettings
+
+CrossBuilding.crossSbtVersions := Seq("0.11.1", "0.11.2", "0.11.3", "0.12", "0.13")
 
 CrossBuilding.scriptedSettings
 
-libraryDependencies += "com.github.mdr" %% "ascii-graphs" % "0.0.2"
+libraryDependencies += "com.github.mdr" %% "ascii-graphs" % "0.0.3"
+
+libraryDependencies <++= scalaVersion { version =>
+  if (version startsWith "2.1") Seq("org.scala-lang" % "scala-reflect" % version % "provided")
+  else Nil
+}
+
+scalacOptions ++= Seq("-deprecation", "-unchecked")
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 80dd7f871..fe876fa09 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -4,4 +4,4 @@ addSbtPlugin("me.lessis" % "ls-sbt" % "0.1.2")
 
 resolvers += "Coda Hale's Repo" at "http://repo.codahale.com"
 
-addSbtPlugin("net.virtual-void" % "sbt-cross-building" % "0.7.0")
+addSbtPlugin("net.virtual-void" % "sbt-cross-building" % "0.8.0-RC1")
diff --git a/src/main/scala-sbt-0.11/sbt/SbtDependencyGraphCompat.scala b/src/main/scala-sbt-0.11/sbt/SbtDependencyGraphCompat.scala
index 6a4bc3535..e6ff9bb49 100644
--- a/src/main/scala-sbt-0.11/sbt/SbtDependencyGraphCompat.scala
+++ b/src/main/scala-sbt-0.11/sbt/SbtDependencyGraphCompat.scala
@@ -9,11 +9,10 @@ object SbtDependencyGraphCompat {
    * to ignore missing artifacts.
    */
   def ignoreMissingUpdateT =
-    ignoreMissingUpdate <<= (ivyModule, thisProjectRef, updateConfiguration, cacheDirectory, scalaInstance, transitiveUpdate, streams) map { (module, ref, config, cacheDirectory, si, reports, s) =>
+    ignoreMissingUpdate <<= (ivyModule, thisProjectRef, updateConfiguration in ignoreMissingUpdate, cacheDirectory, scalaInstance, transitiveUpdate, streams) map { (module, ref, config, cacheDirectory, si, reports, s) =>
 			val depsUpdated = reports.exists(!_.stats.cached)
-      val missingOkConfig = new UpdateConfiguration(config.retrieve, true, config.logging)
 
-			Classpaths.cachedUpdate(cacheDirectory / "update", Project.display(ref), module, missingOkConfig, Some(si), depsUpdated, s.log)
+			Classpaths.cachedUpdate(cacheDirectory / "update", Project.display(ref), module, config, Some(si), depsUpdated, s.log)
 		}
 
   import complete.DefaultParsers._
diff --git a/src/main/scala-sbt-0.12/sbt/SbtDependencyGraphCompat.scala b/src/main/scala-sbt-0.12/sbt/SbtDependencyGraphCompat.scala
index 72826e3f5..56df72740 100644
--- a/src/main/scala-sbt-0.12/sbt/SbtDependencyGraphCompat.scala
+++ b/src/main/scala-sbt-0.12/sbt/SbtDependencyGraphCompat.scala
@@ -9,13 +9,12 @@ object SbtDependencyGraphCompat {
    * to ignore missing artifacts.
    */
   def ignoreMissingUpdateT =
-    ignoreMissingUpdate <<= (ivyModule, thisProjectRef, updateConfiguration, cacheDirectory, scalaInstance, transitiveUpdate, executionRoots, resolvedScoped, skip in update, streams) map {
+    ignoreMissingUpdate <<= (ivyModule, thisProjectRef, updateConfiguration in ignoreMissingUpdate, cacheDirectory, scalaInstance, transitiveUpdate, executionRoots, resolvedScoped, skip in update, streams) map {
 			(module, ref, config, cacheDirectory, si, reports, roots, resolved, skip, s) =>
 				val depsUpdated = reports.exists(!_.stats.cached)
 				val isRoot = roots contains resolved
-        val missingOkConfig = new UpdateConfiguration(config.retrieve, true, config.logging)
 
-				Classpaths.cachedUpdate(cacheDirectory / "update", Project.display(ref), module, missingOkConfig, Some(si), skip = skip, force = isRoot, depsUpdated = depsUpdated, log = s.log)
+				Classpaths.cachedUpdate(cacheDirectory / "update", Project.display(ref), module, config, Some(si), skip = skip, force = isRoot, depsUpdated = depsUpdated, log = s.log)
 		} tag(Tags.Update, Tags.Network)
 
   def getTerminalWidth: Int = JLine.usingTerminal(_.getTerminalWidth)
diff --git a/src/main/scala-sbt-0.13/sbt/SbtDependencyGraphCompat.scala b/src/main/scala-sbt-0.13/sbt/SbtDependencyGraphCompat.scala
new file mode 100644
index 000000000..a75305639
--- /dev/null
+++ b/src/main/scala-sbt-0.13/sbt/SbtDependencyGraphCompat.scala
@@ -0,0 +1,39 @@
+package sbt
+
+import net.virtualvoid.sbt.graph.Plugin._
+import Keys._
+import CrossVersion._
+
+object SbtDependencyGraphCompat {
+  /**
+   * This is copied directly from sbt/main/Defaults.java and then changed to update the UpdateConfiguration
+   * to ignore missing artifacts.
+   */
+  def ignoreMissingUpdateT =
+    ignoreMissingUpdate <<= Def.task {
+      val depsUpdated = transitiveUpdate.value.exists(!_.stats.cached)
+      val isRoot = executionRoots.value contains resolvedScoped.value
+      val s = streams.value
+      val scalaProvider = appConfiguration.value.provider.scalaProvider
+
+      // Only substitute unmanaged jars for managed jars when the major.minor parts of the versions the same for:
+      //   the resolved Scala version and the scalaHome version: compatible (weakly- no qualifier checked)
+      //   the resolved Scala version and the declared scalaVersion: assume the user intended scalaHome to override anything with scalaVersion
+      def subUnmanaged(subVersion: String, jars: Seq[File])  =  (sv: String) =>
+        (partialVersion(sv), partialVersion(subVersion), partialVersion(scalaVersion.value)) match {
+          case (Some(res), Some(sh), _) if res == sh => jars
+          case (Some(res), _, Some(decl)) if res == decl => jars
+          case _ => Nil
+        }
+      val subScalaJars: String => Seq[File] = Defaults.unmanagedScalaInstanceOnly.value match {
+        case Some(si) => subUnmanaged(si.version, si.jars)
+        case None => sv => if(scalaProvider.version == sv) scalaProvider.jars else Nil
+      }
+      val transform: UpdateReport => UpdateReport = r => Classpaths.substituteScalaFiles(scalaOrganization.value, r)(subScalaJars)
+
+      val show = Reference.display(thisProjectRef.value)
+      Classpaths.cachedUpdate(s.cacheDirectory, show, ivyModule.value, (updateConfiguration in ignoreMissingUpdate).value, transform, skip = (skip in update).value, force = isRoot, depsUpdated = depsUpdated, log = s.log)
+    }
+
+  def getTerminalWidth: Int = JLine.usingTerminal(_.getWidth)
+}
diff --git a/src/main/scala/net/virtualvoid/sbt/graph/Plugin.scala b/src/main/scala/net/virtualvoid/sbt/graph/Plugin.scala
index 4ca5fd38a..24f6cca6a 100755
--- a/src/main/scala/net/virtualvoid/sbt/graph/Plugin.scala
+++ b/src/main/scala/net/virtualvoid/sbt/graph/Plugin.scala
@@ -79,6 +79,7 @@ object Plugin extends sbt.Plugin {
           (c: String) => file("%s/cache/%s-%s-%s.xml" format (home, projectID.organization, crossName(ivyModule), c))
       }
     },
+    updateConfiguration in ignoreMissingUpdate <<= updateConfiguration(config => new UpdateConfiguration(config.retrieve, true, config.logging)),
     SbtDependencyGraphCompat.ignoreMissingUpdateT,
     filterScalaLibrary in Global := true
   ) ++ Seq(Compile, Test, Runtime, Provided, Optional).flatMap(ivyReportForConfig)
diff --git a/src/sbt-test/sbt-dependency-graph/intervalRangedVersions/build.sbt b/src/sbt-test/sbt-dependency-graph/intervalRangedVersions/build.sbt
index 19030bcf6..0ef12f58a 100644
--- a/src/sbt-test/sbt-dependency-graph/intervalRangedVersions/build.sbt
+++ b/src/sbt-test/sbt-dependency-graph/intervalRangedVersions/build.sbt
@@ -2,7 +2,7 @@ import net.virtualvoid.sbt.graph.Plugin._
 
 graphSettings
 
-scalaVersion := "2.9.2"
+scalaVersion := "2.9.1"
 
 libraryDependencies ++= Seq(
   "com.codahale" % "jerkson_2.9.1" % "0.5.0"
@@ -13,9 +13,9 @@ TaskKey[Unit]("check") <<= (ivyReport in Test, asciiTree in Test) map { (report,
   val expectedGraph =
     """default:default-dbc48d_2.9.2:0.1-SNAPSHOT [S]
       |  +-com.codahale:jerkson_2.9.1:0.5.0 [S]
-      |    +-org.codehaus.jackson:jackson-core-asl:1.9.12
-      |    +-org.codehaus.jackson:jackson-mapper-asl:1.9.12
-      |      +-org.codehaus.jackson:jackson-core-asl:1.9.12
+      |    +-org.codehaus.jackson:jackson-core-asl:1.9.13
+      |    +-org.codehaus.jackson:jackson-mapper-asl:1.9.13
+      |      +-org.codehaus.jackson:jackson-core-asl:1.9.13
       |  """.stripMargin
   IO.writeLines(file("/tmp/blib"), sanitize(graph).split("\n"))
   IO.writeLines(file("/tmp/blub"), sanitize(expectedGraph).split("\n"))
diff --git a/src/sbt-test/sbt-dependency-graph/testDotFileGeneration/project/Build.scala b/src/sbt-test/sbt-dependency-graph/testDotFileGeneration/project/Build.scala
index 2becd0917..a4a1622ba 100644
--- a/src/sbt-test/sbt-dependency-graph/testDotFileGeneration/project/Build.scala
+++ b/src/sbt-test/sbt-dependency-graph/testDotFileGeneration/project/Build.scala
@@ -10,20 +10,20 @@ object Build extends sbt.Build {
     seq(scalaVersion := "2.9.2")
 
   lazy val justATransiviteDependencyEndpointProject =
-    Project("just-a-transitive-dependency-endpoint", file("."))
+    Project("just-a-transitive-dependency-endpoint", file("a"))
       .settings(defaultSettings: _*)
 
   lazy val justATransitiveDependencyProject =
-    Project("just-a-transitive-dependency", file("."))
+    Project("just-a-transitive-dependency", file("b"))
       .settings(defaultSettings: _*)
       .dependsOn(justATransiviteDependencyEndpointProject)
 
   lazy val justADependencyProject =
-    Project("just-a-dependency", file("."))
+    Project("just-a-dependency", file("c"))
       .settings(defaultSettings: _*)
 
   lazy val test_project =
-    Project("test-dot-file-generation", file("."))
+    Project("test-dot-file-generation", file("d"))
       .settings(graphSettings: _*)
       .settings(defaultSettings: _*)
       .settings(