diff --git a/.travis.yml b/.travis.yml
index 92ffa3e..9b27b66 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,8 +3,8 @@ language: scala
 scala:
   - 2.10.7
   - 2.11.12
-  - 2.12.5
-  - 2.13.0-M4
+  - 2.12.8
+  - 2.13.0-RC2
 
 jdk:
   - oraclejdk8
diff --git a/build.sbt b/build.sbt
index 0c12e90..9709a3c 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,5 +1,5 @@
 import ReleaseTransformations._
-import sbtcrossproject.crossProject
+import sbtcrossproject.CrossPlugin.autoImport.crossProject
 
 organization in ThisBuild := "io.estatico"
 
@@ -23,17 +23,20 @@ lazy val catsTests = crossProject(JSPlatform, JVMPlatform).in(file("cats-tests")
   .settings(
     name := "newtype-cats-tests",
     description := "Test suite for newtype + cats interop",
-    libraryDependencies ++= Seq(
-      "org.typelevel" %%% "cats-core" % "1.2.0"
-    )
+    libraryDependencies += {
+      if (scalaVersion.value.startsWith("2.10."))
+        "org.typelevel" %%% "cats-core" % "1.2.0"
+      else
+        "org.typelevel" %%% "cats-core" % "2.0.0-M2"
+    }
   )
 
 lazy val catsTestsJVM = catsTests.jvm
 lazy val catsTestsJS = catsTests.js
 
 lazy val noPublishSettings = Seq(
-  publish := (),
-  publishLocal := (),
+  publish := {},
+  publishLocal := {},
   publishArtifact := false
 )
 
@@ -127,8 +130,8 @@ lazy val defaultLibraryDependencies = libraryDependencies ++= Seq(
   "org.typelevel" %% "macro-compat" % "1.1.1",
   scalaOrganization.value % "scala-reflect" % scalaVersion.value % Provided,
   scalaOrganization.value % "scala-compiler" % scalaVersion.value % Provided,
-  "org.scalacheck" %%% "scalacheck" % "1.14.0" % "test",
-  "org.scalatest" %%% "scalatest" % "3.0.6-SNAP1" % "test"
+  "org.scalacheck" %%% "scalacheck" % "1.14.0" % Test,
+  "org.scalatest" %%% "scalatest" % "3.0.8-RC4" % Test
 )
 
 def scalaPartV = Def.setting(CrossVersion.partialVersion(scalaVersion.value))
diff --git a/cats-tests/shared/src/test/scala/io/estatico/newtype/NewTypeCatsTest.scala b/cats-tests/shared/src/test/scala/io/estatico/newtype/NewTypeCatsTest.scala
index 3f5fd8c..20168c6 100644
--- a/cats-tests/shared/src/test/scala/io/estatico/newtype/NewTypeCatsTest.scala
+++ b/cats-tests/shared/src/test/scala/io/estatico/newtype/NewTypeCatsTest.scala
@@ -5,9 +5,9 @@ import cats.implicits._
 import io.estatico.newtype.ops._
 import io.estatico.newtype.macros.{newsubtype, newtype}
 import org.scalatest.{FlatSpec, Matchers}
-import org.scalatest.prop.GeneratorDrivenPropertyChecks
+import org.scalatestplus.scalacheck.ScalaCheckPropertyChecks
 
-class NewTypeCatsTest extends FlatSpec with Matchers with GeneratorDrivenPropertyChecks {
+class NewTypeCatsTest extends FlatSpec with Matchers with ScalaCheckPropertyChecks {
 
   import NewTypeCatsTest._
 
diff --git a/jvm/src/test/scala/io/estatico/newtype/macros/NewTypeMacrosJVMTest.scala b/jvm/src/test/scala/io/estatico/newtype/macros/NewTypeMacrosJVMTest.scala
index fd9165e..1078567 100644
--- a/jvm/src/test/scala/io/estatico/newtype/macros/NewTypeMacrosJVMTest.scala
+++ b/jvm/src/test/scala/io/estatico/newtype/macros/NewTypeMacrosJVMTest.scala
@@ -8,7 +8,7 @@ class NewTypeMacrosJVMTest extends FlatSpec with Matchers {
 
   it should "not box primitives" in {
     // Introspect the runtime type returned by the `apply` method
-    def ctorReturnType(o: Any) = List(o.getClass.getMethods: _*).find(_.getName == "apply").get.getReturnType
+    def ctorReturnType(o: Any) = scala.Predef.genericArrayOps(o.getClass.getMethods).find(_.getName == "apply").get.getReturnType
 
     // newtypes will box primitive values.
     @newtype case class BoxedInt(private val x: Int)
diff --git a/project/build.properties b/project/build.properties
index 0db266d..dca663d 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version = 0.13.17
+sbt.version = 1.2.8
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 0e5bd0f..f7cee7b 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1,6 +1,6 @@
-addSbtPlugin("com.jsuereth" % "sbt-pgp" % "1.0.1")
-addSbtPlugin("com.github.gseitz" % "sbt-release" % "1.0.4")
-addSbtPlugin("com.dwijnand" % "sbt-travisci" % "1.1.0")
-addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "1.1")
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "0.6.23")
-addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "0.5.0")
+addSbtPlugin("com.jsuereth" % "sbt-pgp" % "1.1.1")
+addSbtPlugin("com.github.gseitz" % "sbt-release" % "1.0.11")
+addSbtPlugin("com.dwijnand" % "sbt-travisci" % "1.1.3")
+addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "2.5")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "0.6.28")
+addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "0.6.0")
diff --git a/shared/src/main/scala/io/estatico/newtype/macros/NewTypeMacros.scala b/shared/src/main/scala/io/estatico/newtype/macros/NewTypeMacros.scala
index fda5084..39889ba 100644
--- a/shared/src/main/scala/io/estatico/newtype/macros/NewTypeMacros.scala
+++ b/shared/src/main/scala/io/estatico/newtype/macros/NewTypeMacros.scala
@@ -228,7 +228,7 @@ private[macros] class NewTypeMacros(val c: blackbox.Context)
     clsDef: ClassDef, valDef: ValDef, tparamsNoVar: List[TypeDef], tparamNames: List[TypeName]
   ): List[Tree] = {
     val extensionMethods =
-      maybeGenerateValMethod(clsDef, valDef) ++ getInstanceMethods(clsDef)
+      maybeGenerateValMethod(clsDef, valDef).toList ++ getInstanceMethods(clsDef)
 
     if (extensionMethods.isEmpty) {
       Nil
diff --git a/shared/src/test/scala/io/estatico/newtype/NewTypeTest.scala b/shared/src/test/scala/io/estatico/newtype/NewTypeTest.scala
index bd006e4..a02a01d 100644
--- a/shared/src/test/scala/io/estatico/newtype/NewTypeTest.scala
+++ b/shared/src/test/scala/io/estatico/newtype/NewTypeTest.scala
@@ -1,10 +1,10 @@
 package io.estatico.newtype
 
 import org.scalacheck.Arbitrary
-import org.scalatest.prop.PropertyChecks
+import org.scalatestplus.scalacheck.ScalaCheckPropertyChecks
 import org.scalatest.{FlatSpec, Matchers}
 
-class NewTypeTest extends FlatSpec with PropertyChecks with Matchers {
+class NewTypeTest extends FlatSpec with ScalaCheckPropertyChecks with Matchers {
 
   import NewTypeTest._