diff --git a/build.sbt b/build.sbt
index 73326ad2f..d4fe7db5a 100644
--- a/build.sbt
+++ b/build.sbt
@@ -21,9 +21,9 @@ lazy val commonSettings = Seq(
   scalaVersion       := scalaVer,
   crossScalaVersions := {
     if (scalaJSVersion.startsWith("0.6")) {
-      Seq("2.10.7", "2.11.12", "2.12.7", "2.13.0-M5")
+      Seq("2.10.7", "2.11.12", "2.12.8", "2.13.0-M5")
     } else {
-      Seq("2.11.12", "2.12.7", "2.13.0-M5")
+      Seq("2.11.12", "2.12.8", "2.13.0-M5")
     }
   },
   scalacOptions ++= Seq(
diff --git a/core/js/src/main/scala/java/util/TimeZone.scala b/core/js/src/main/scala/java/util/TimeZone.scala
index 0d2287f4c..051a2b05b 100644
--- a/core/js/src/main/scala/java/util/TimeZone.scala
+++ b/core/js/src/main/scala/java/util/TimeZone.scala
@@ -29,7 +29,7 @@ object TimeZone {
     // This is supported since EcmaScript 1
     def offsetInMillis: Int = {
       val browserDate = new scalajs.js.Date()
-      browserDate.getTimezoneOffset() * 60 * 1000
+      browserDate.getTimezoneOffset().toInt * 60 * 1000
     }
 
     def timeZone: String = {
diff --git a/project/plugins.sbt b/project/plugins.sbt
index 7f0562ca9..b0f9da9c0 100644
--- a/project/plugins.sbt
+++ b/project/plugins.sbt
@@ -1,5 +1,5 @@
 
-addSbtPlugin("com.47deg"  % "sbt-microsites" % "0.7.15")
+addSbtPlugin("com.47deg"  % "sbt-microsites" % "0.7.27")
 
 addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "2.0")