diff --git a/.travis.yml b/.travis.yml
index 060b447c..92e0f94a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,4 +13,6 @@ env:
 
 script: admin/build.sh
 
-jdk: oraclejdk8
+jdk:
+  - oraclejdk8
+  - openjdk11
diff --git a/build.sbt b/build.sbt
index 25860796..ed9f2e87 100644
--- a/build.sbt
+++ b/build.sbt
@@ -6,7 +6,7 @@ scalaVersionsByJvm in ThisBuild := {
   val v213 = "2.13.0-M3"
   Map(
     8 -> List(v213 -> true),
-    9 -> List(v213 -> false))
+    11 -> List(v213 -> false))
 }
 
 scalacOptions in ThisBuild ++= Seq("-deprecation", "-feature", "-Xfatal-warnings")
@@ -53,7 +53,9 @@ lazy val core = project.in(file("core")).settings(scalaModuleSettings).settings(
 )
 
 lazy val junit = project.in(file("junit")).settings(
-  libraryDependencies += "com.novocode" % "junit-interface" % "0.11" % "test",
+  libraryDependencies += "com.novocode" % "junit-interface" % "0.11" % Test,
+  // for javax.xml.bind.DatatypeConverter, used in SerializationStabilityTest
+  libraryDependencies += "javax.xml.bind" % "jaxb-api" % "2.3.0" % Test,
   testOptions += Tests.Argument(TestFrameworks.JUnit, "-a", "-v"),
   fork in Test := true,
   disablePublishing
diff --git a/junit/src/test/scala/scala/SerializationStabilityTest.scala b/junit/src/test/scala/scala/SerializationStabilityTest.scala
index edf3be86..9551ff44 100644
--- a/junit/src/test/scala/scala/SerializationStabilityTest.scala
+++ b/junit/src/test/scala/scala/SerializationStabilityTest.scala
@@ -30,7 +30,8 @@ object SerializationStability extends App {
   def patch(file: File, line: Int, prevResult: String, result: String): Unit = {
     amend(file) {
       content =>
-        content.lines.toList.zipWithIndex.map {
+        // Predef.augmentString = work around scala/bug#11125 on JDK 11
+        augmentString(content).lines.toList.zipWithIndex.map {
           case (content, i) if i == line - 1 =>
             val newContent = content.replaceAllLiterally(quote(prevResult), quote(result))
             if (newContent != content)
@@ -50,7 +51,8 @@ object SerializationStability extends App {
     val newComment = s"  // Generated on $timestamp with Scala ${scala.util.Properties.versionString})"
     amend(file) {
       content =>
-        content.lines.toList.map {
+        // Predef.augmentString = work around scala/bug#11125 on JDK 11
+        augmentString(content).lines.toList.map {
           f => f.replaceAll("""^ +// Generated on.*""", newComment)
         }.mkString("\n")
     }