diff --git a/build.sbt b/build.sbt
index 5a35b487..a615dcd3 100644
--- a/build.sbt
+++ b/build.sbt
@@ -2,9 +2,9 @@ import ReactiveBuild._
 import sbtcrossproject.CrossPlugin.autoImport.{crossProject, CrossType}
 
 
-crossScalaVersions in ThisBuild := Seq("2.11.12", "2.12.8")
+ThisBuild / crossScalaVersions := Seq("2.12.8", "2.13.0")
 
-scalaVersion in ThisBuild := "2.12.8"
+ThisBuild / scalaVersion := (ThisBuild / crossScalaVersions).value.last
 
 organization in ThisBuild := "cc.co.scala-reactive"
 
@@ -13,9 +13,8 @@ scalacOptions in ThisBuild ++=
     "-deprecation",
     "-feature",
     "-unchecked",
-    "-Xlint",
-    "-Ywarn-unused-import",
-    "-Ywarn-unused",
+    "-Xlint:_",
+    "-Ywarn-unused:_",
     "-Ywarn-value-discard"
   )
 
diff --git a/reactive-web/build.sbt b/reactive-web/build.sbt
index 6137b0d7..594f49e4 100644
--- a/reactive-web/build.sbt
+++ b/reactive-web/build.sbt
@@ -4,7 +4,7 @@ description := "FRP-based abstractions to control the browser from the server"
 
 libraryDependencies += "net.liftweb" %% "lift-util" % Dependencies.liftVersion
 
-libraryDependencies += "io.circe" %% "circe-parser" % "0.11.2"
+libraryDependencies += "io.circe" %% "circe-parser" % "0.12.3"
 
 libraryDependencies += "org.scalatest"  %% "scalatest"  % "3.0.8"  % "test"