diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 33f409b3..23862471 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -26,7 +26,7 @@ jobs:
           java-version: 11
 
       - name: run tests
-        run: sbt ++2.12.12 test
+        run: sbt ++2.12.10 test
 
   scala-2_13:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 3805efb7..05ffb87b 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -22,7 +22,7 @@ jobs:
           java-version: 11
 
       - name: run tests
-        run: sbt ++2.12.12 test
+        run: sbt ++2.12.10 test
 
   scala-2_13:
     runs-on: ubuntu-latest
diff --git a/.travis.yml b/.travis.yml
index c03e55b7..75d0ea64 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,7 +7,7 @@ jdk:
   - openjdk8
 
 scala:
-  - 2.12.12
+  - 2.12.10
   - 2.13.3
 
 before_cache:
diff --git a/build.sbt b/build.sbt
index 62fb19df..6005c089 100644
--- a/build.sbt
+++ b/build.sbt
@@ -10,8 +10,8 @@ val ScalatestVersion = "3.1.1"
 
 val appSettings = Seq(
     organization := Org,
-    scalaVersion := "2.13.3",
-    crossScalaVersions := Seq("2.12.12", "2.13.3"),
+    scalaVersion := "2.12.10",
+    crossScalaVersions := Seq("2.12.10", "2.13.3"),
     fork in Test := false,
     publishMavenStyle := true,
     publishArtifact in Test := false,
@@ -24,6 +24,9 @@ val appSettings = Seq(
       else
         Some("releases" at "https://oss.sonatype.org/service/local/staging/deploy/maven2")
     },
+    libraryDependencies ++= Seq(
+      "org.scala-lang" % "scala-compiler" % scalaVersion.value % Compile
+    ),
     pomExtra := {
       <url>https://github.com/scoverage/scalac-scoverage-plugin</url>
         <licenses>
@@ -89,11 +92,10 @@ lazy val plugin = Project("scalac-scoverage-plugin", file("scalac-scoverage-plug
     .settings(
       libraryDependencies ++= Seq(
         "org.scala-lang.modules" %% "scala-xml" % "1.2.0",
-        "org.scalatest" %% "scalatest" % ScalatestVersion % Test,
-        "org.scala-lang" % "scala-compiler" % scalaVersion.value % Provided
+        "org.scalatest" %% "scalatest" % ScalatestVersion % Test
       )
     )
   .settings(
-    unmanagedSourceDirectories in Test += (sourceDirectory in Test).value / "scala-2.11+"
+    unmanagedSourceDirectories in Test += (sourceDirectory in Test).value / "scala-2.12+"
   )
 
diff --git a/scalac-scoverage-plugin/src/test/scala/scoverage/ScoverageCompiler.scala b/scalac-scoverage-plugin/src/test/scala/scoverage/ScoverageCompiler.scala
index 27a824e5..a5440a76 100644
--- a/scalac-scoverage-plugin/src/test/scala/scoverage/ScoverageCompiler.scala
+++ b/scalac-scoverage-plugin/src/test/scala/scoverage/ScoverageCompiler.scala
@@ -4,20 +4,20 @@ import java.io.{File, FileNotFoundException}
 import java.net.URL
 
 import scala.collection.mutable.ListBuffer
-import scala.tools.nsc.{Settings, Global}
+import scala.tools.nsc.{Global, Settings}
 import scala.tools.nsc.plugins.PluginComponent
 import scala.tools.nsc.transform.{Transform, TypingTransformers}
 
-/** @author Stephen Samuel */
 object ScoverageCompiler {
 
-  val ScalaVersion = scala.util.Properties.versionNumberString
-  val ShortScalaVersion = (ScalaVersion split "[.]").toList match {
+  val ScalaVersion: String = scala.util.Properties.versionNumberString
+  val ShortScalaVersion: String = (ScalaVersion split "[.]").toList match {
     case init :+ last if last forall (_.isDigit) => init mkString "."
-    case _                                       => ScalaVersion
+    case _ => ScalaVersion
   }
 
-  def classPath = getScalaJars.map(_.getAbsolutePath) :+ sbtCompileDir.getAbsolutePath :+ runtimeClasses.getAbsolutePath
+  def classPath: Seq[String] =
+    getScalaJars.map(_.getAbsolutePath) :+ sbtCompileDir.getAbsolutePath :+ runtimeClasses.getAbsolutePath
 
   def settings: Settings = {
     val s = new scala.tools.nsc.Settings
@@ -57,15 +57,25 @@ object ScoverageCompiler {
 
   private def runtimeClasses: File = new File(s"./scalac-scoverage-runtime/jvm/target/scala-$ShortScalaVersion/classes")
 
-  private def findScalaJar(artifactId: String): File = findIvyJar("org.scala-lang", artifactId, ScalaVersion)
+  private def findScalaJar(artifactId: String): File =
+    findIvyJar("org.scala-lang", artifactId, ScalaVersion)
+      .orElse(findCoursierJar(artifactId, ScalaVersion))
+      .getOrElse {
+        throw new FileNotFoundException(s"Could not locate $artifactId/$ScalaVersion")
+      }
+
+  private def findCoursierJar(artifactId: String, version: String): Option[File] = {
+    val userHome = System.getProperty("user.home")
+    val jarPath = s"$userHome/.cache/coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/$artifactId/$version/$artifactId-$version.jar"
+    val file = new File(jarPath)
+    if (file.exists()) Some(file) else None
+  }
 
-  private def findIvyJar(groupId: String, artifactId: String, version: String, packaging: String = "jar"): File = {
+  private def findIvyJar(groupId: String, artifactId: String, version: String, packaging: String = "jar"): Option[File] = {
     val userHome = System.getProperty("user.home")
     val jarPath = s"$userHome/.ivy2/cache/$groupId/$artifactId/${packaging}s/$artifactId-$version.jar"
     val file = new File(jarPath)
-    if (!file.exists)
-      throw new FileNotFoundException(s"Could not locate [$jarPath].")
-    file
+    if (file.exists()) Some(file) else None
   }
 }
 
diff --git a/scalac-scoverage-plugin/src/test/scala/scoverage/macrosupport/Tester.scala b/scalac-scoverage-plugin/src/test/scala/scoverage/macrosupport/Tester.scala
index 70b1788a..78386a68 100644
--- a/scalac-scoverage-plugin/src/test/scala/scoverage/macrosupport/Tester.scala
+++ b/scalac-scoverage-plugin/src/test/scala/scoverage/macrosupport/Tester.scala
@@ -4,6 +4,6 @@ import scala.language.experimental.macros
 
 object Tester {
 
-  def test: Unit = macro TesterMacro.test
+//  def test: Unit = macro TesterMacro.test
 
 }