diff --git a/.travis.yml b/.travis.yml
index 790059e..c45f53f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,8 @@
 language: scala
 scala:
-  - 2.11.8
-  - 2.12.1
+  - 2.11.12
+  - 2.12.10
+  - 2.13.1
 
 sudo: false
 
@@ -20,9 +21,5 @@ before_cache:
   - find $HOME/.sbt -name "*.lock" -delete
 
 jdk:
- - oraclejdk8
+ - openjdk8
 
-addons:
-  apt:
-    packages:
-      - oracle-java8-installer
diff --git a/build.sbt b/build.sbt
index 1e8ba7a..a4c6cde 100644
--- a/build.sbt
+++ b/build.sbt
@@ -2,8 +2,8 @@ sonatypeProfileName := "org.xerial"
 
 import ReleaseTransformations._
 
-val SCALA_VERSION = "2.12.4"
-val CROSS_SCALA_VERSIONS = Seq(SCALA_VERSION, "2.11.11")
+val SCALA_VERSION = "2.13.1"
+val CROSS_SCALA_VERSIONS = Seq(SCALA_VERSION, "2.11.12", "2.12.10")
 scalaVersion in ThisBuild := SCALA_VERSION
 
 val buildSettings = Defaults.coreDefaultSettings ++ Seq(
@@ -116,15 +116,13 @@ lazy val larrayScala = Project(
       },
       libraryDependencies ++= Seq(
         // Add dependent jars here
-        "org.wvlet" %% "wvlet-log" % "1.1",
+        "org.wvlet.airframe" %% "airframe-log" % "19.9.8",
         snappy % "test",
         junit,
         "org.iq80.snappy" % "snappy" % "0.3" % "test",
         "com.novocode" % "junit-interface" % "0.11" % "test",
-        "org.scalatest" %% "scalatest" % "3.0.1" % "test",
-        "org.scalacheck" %% "scalacheck" % "1.13.4" % "test",
-        "com.typesafe.akka" %% "akka-testkit" % "[2.3.14, 2.5)" % "test",
-        "com.typesafe.akka" %% "akka-multi-node-testkit" % "[2.3.14, 2.5)" % "test"
+        "org.scalatest" %% "scalatest" % "3.0.8" % "test",
+        "org.scalacheck" %% "scalacheck" % "1.14.0" % "test"
       )
     )
 ) dependsOn(larrayBuffer % scope, larrayMMap) configs (MultiJvm)
@@ -136,10 +134,18 @@ lazy val larrayBuffer = Project(
     description := "LArray off-heap buffer library",
     crossPaths := false,
     autoScalaLibrary := false,
-    libraryDependencies ++= Seq(
-      "org.scalatest" %% "scalatest" % "3.0.1" % "test",
-      "org.wvlet" %% "wvlet-log" % "1.1" % "test"
-    )
+    libraryDependencies ++= {
+      val parallelCollections = CrossVersion.partialVersion(scalaVersion.value) match {
+        case Some((2, major)) if major >= 13 =>
+          Seq("org.scala-lang.modules" %% "scala-parallel-collections" % "0.2.0" % "test")
+        case _ =>
+          Seq()
+      }
+      Seq(
+        "org.scalatest" %% "scalatest" % "3.0.8" % "test",
+        "org.wvlet.airframe" %% "airframe-log" % "19.9.8"
+      ) ++ parallelCollections
+    }
   )
 )
 
diff --git a/larray-buffer/src/test/scala/xerial/larray/buffer/LBufferTest.scala b/larray-buffer/src/test/scala/xerial/larray/buffer/LBufferTest.scala
index 8209a53..7e25144 100644
--- a/larray-buffer/src/test/scala/xerial/larray/buffer/LBufferTest.scala
+++ b/larray-buffer/src/test/scala/xerial/larray/buffer/LBufferTest.scala
@@ -106,7 +106,8 @@ class LBufferTest extends LArraySpec {
     "allocate concurrently" taggedAs("bench") in {
 
       val N = 100
-      def range = (0 until N).par
+
+      def range = collection.parallel.immutable.ParRange(0, N, 1, inclusive = false)
       val R = 2
       val S = 1024 * 1024
 
@@ -206,4 +207,4 @@ class LBufferTest extends LArraySpec {
     }
 
   }
-}
\ No newline at end of file
+}
diff --git a/larray-buffer/src/test/scala/xerial/larray/buffer/MemoryAllocatorTest.scala b/larray-buffer/src/test/scala/xerial/larray/buffer/MemoryAllocatorTest.scala
index a743258..02fb267 100644
--- a/larray-buffer/src/test/scala/xerial/larray/buffer/MemoryAllocatorTest.scala
+++ b/larray-buffer/src/test/scala/xerial/larray/buffer/MemoryAllocatorTest.scala
@@ -37,7 +37,8 @@ class MemoryAllocatorTest extends LArraySpec {
 
       val t = time("alloc", repeat = 5) {
         block("concurrent") {
-          val l = for (i <- (0 until N).par) yield {
+          val range = collection.parallel.immutable.ParRange(0, N, 1, inclusive = false)
+          val l = for (i <- range) yield {
             val a = new LBuffer(B)
             a(B-1) = 1.toByte
             a
@@ -46,7 +47,8 @@ class MemoryAllocatorTest extends LArraySpec {
         }
 
         block("Array") {
-          val l = for (i <- (0 until N).par) yield {
+          val range = collection.parallel.immutable.ParRange(0, N, 1, inclusive = false)
+          val l = for (i <- range) yield {
             val a = new Array[Int](B)
             a(B-1) = 1
             a
@@ -56,4 +58,4 @@ class MemoryAllocatorTest extends LArraySpec {
       t("concurrent") should be <= (t("Array"))
     }
   }
-}
\ No newline at end of file
+}
diff --git a/larray/src/main/scala/xerial/larray/LArrayBuilder.scala b/larray/src/main/scala/xerial/larray/LArrayBuilder.scala
index 86403ab..8f38de5 100644
--- a/larray/src/main/scala/xerial/larray/LArrayBuilder.scala
+++ b/larray/src/main/scala/xerial/larray/LArrayBuilder.scala
@@ -57,7 +57,7 @@ trait LBuilder[Elem, +To] extends WritableByteChannel {
     * @param xs the TraversableOnce producing the elements to add.
     * @return the coll itself.
     */
-  def ++=(xs: TraversableOnce[Elem]): this.type = {xs.seq foreach +=; this}
+  def ++=(xs: TraversableOnce[Elem]): this.type = {xs.toSeq.foreach( += ); this}
 
   def ++=(xs: LIterator[Elem]): this.type = {xs foreach +=; this}
 
@@ -426,4 +426,4 @@ object LArrayBuilder {
     }
   }
 
-}
\ No newline at end of file
+}
diff --git a/project/build.properties b/project/build.properties
index 27e88aa..8e682c5 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=0.13.13
+sbt.version=0.13.18