diff --git a/.travis.yml b/.travis.yml
index cd27c1101..e9e807a88 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,8 @@ language: scala
 scala:
    - 2.11.1
 
+sudo: false
+
 jdk:
   - openjdk6
   - openjdk7
@@ -12,7 +14,14 @@ branches:
   only:
     - /^v07.*$/
 
-script: sbt ++$TRAVIS_SCALA_VERSION test
+script:
+  - sbt ++$TRAVIS_SCALA_VERSION test
+  - find $HOME/.sbt -name "*.lock" | xargs rm
+  - find $HOME/.ivy2 -name "ivydata-*.properties" | xargs rm
+
+cache:
+  directories:
+    - $HOME/.ivy2/cache
 
 notifications:
   email:
diff --git a/msgpack-core/src/test/scala/org/msgpack/core/MessageUnpackerTest.scala b/msgpack-core/src/test/scala/org/msgpack/core/MessageUnpackerTest.scala
index 1428c68a9..f906898a3 100644
--- a/msgpack-core/src/test/scala/org/msgpack/core/MessageUnpackerTest.scala
+++ b/msgpack-core/src/test/scala/org/msgpack/core/MessageUnpackerTest.scala
@@ -553,7 +553,7 @@ class MessageUnpackerTest extends MessagePackSpec {
       val mb = MessageBuffer.wrap(arr)
 
       val N = 1000
-      val t = time("unpacker", repeat = 10) {
+      val t = time("unpacker", repeat = 30) {
         block("no-buffer-reset") {
           IOUtil.withResource(msgpack.newUnpacker(arr)) { unpacker =>
             for (i <- 0 until N) {