diff --git a/build.sbt b/build.sbt
index 849dc07f..0bec6d64 100644
--- a/build.sbt
+++ b/build.sbt
@@ -5,7 +5,7 @@ import com.typesafe.tools.mima.plugin.MimaPlugin.mimaDefaultSettings
 import scala.collection.JavaConverters._
 import scalariform.formatter.preferences._
 
-val kryoVersion = "3.0.3"
+val kryoVersion = "4.0.0"
 val bijectionVersion = "0.9.0"
 val algebirdVersion = "0.12.0"
 
diff --git a/chill-scala/src/main/scala/com/twitter/chill/ClassTagSerializer.scala b/chill-scala/src/main/scala/com/twitter/chill/ClassTagSerializer.scala
new file mode 100644
index 00000000..600f976c
--- /dev/null
+++ b/chill-scala/src/main/scala/com/twitter/chill/ClassTagSerializer.scala
@@ -0,0 +1,31 @@
+/*
+Copyright 2012 Twitter, Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package com.twitter.chill
+
+import scala.reflect.ClassTag
+
+class ClassTagSerializer[T] extends KSerializer[ClassTag[T]] {
+
+  def write(kser: Kryo, out: Output, obj: ClassTag[T]) {
+    kser.writeObject(out, obj.runtimeClass)
+  }
+
+  def read(kser: Kryo, in: Input, cls: Class[ClassTag[T]]): ClassTag[T] = {
+    val clazz = kser.readObject(in, classOf[Class[T]])
+    ClassTag(clazz)
+  }
+}
diff --git a/chill-scala/src/main/scala/com/twitter/chill/ManifestSerializer.scala b/chill-scala/src/main/scala/com/twitter/chill/ManifestSerializer.scala
index 2d061e8a..4f1e3f34 100644
--- a/chill-scala/src/main/scala/com/twitter/chill/ManifestSerializer.scala
+++ b/chill-scala/src/main/scala/com/twitter/chill/ManifestSerializer.scala
@@ -32,7 +32,7 @@ class ManifestSerializer[T] extends KSerializer[Manifest[T]] {
       out.writeInt(idxOpt.get + 1, true)
     } else {
       out.writeInt(0, true)
-      kser.writeObject(out, obj.erasure)
+      kser.writeObject(out, obj.runtimeClass)
       //write the type arguments:
       val targs = obj.typeArguments
       out.writeInt(targs.size, true)
diff --git a/chill-scala/src/main/scala/com/twitter/chill/ScalaKryoInstantiator.scala b/chill-scala/src/main/scala/com/twitter/chill/ScalaKryoInstantiator.scala
index dbbc7818..fd0c4638 100644
--- a/chill-scala/src/main/scala/com/twitter/chill/ScalaKryoInstantiator.scala
+++ b/chill-scala/src/main/scala/com/twitter/chill/ScalaKryoInstantiator.scala
@@ -47,6 +47,7 @@ import com.twitter.chill.java.PackageRegistrar
 import _root_.java.io.Serializable
 
 import scala.collection.JavaConverters._
+import scala.reflect.ClassTag
 
 /**
  * This class has a no-arg constructor, suitable for use with reflection instantiation
@@ -193,7 +194,7 @@ class AllScalaRegistrar extends IKryoRegistrar {
       def read(k: Kryo, in: Input, cls: Class[Symbol]) = Symbol(in.readString)
     })
       .forSubclass[Regex](new RegexSerializer)
-      .forClass[ClassManifest[Any]](new ClassManifestSerializer[Any])
+      .forClass[ClassTag[Any]](new ClassTagSerializer[Any])
       .forSubclass[Manifest[Any]](new ManifestSerializer[Any])
       .forSubclass[scala.Enumeration#Value](new EnumerationSerializer)
 
diff --git a/chill-scala/src/main/scala/com/twitter/chill/WrappedArraySerializer.scala b/chill-scala/src/main/scala/com/twitter/chill/WrappedArraySerializer.scala
index 64ea56a2..20a2126b 100644
--- a/chill-scala/src/main/scala/com/twitter/chill/WrappedArraySerializer.scala
+++ b/chill-scala/src/main/scala/com/twitter/chill/WrappedArraySerializer.scala
@@ -25,7 +25,7 @@ class WrappedArraySerializer[T] extends KSerializer[WrappedArray[T]] {
   def write(kser: Kryo, out: Output, obj: WrappedArray[T]) {
     // Write the class-manifest, we don't use writeClass because it
     // uses the registration system, and this class might not be registered
-    kser.writeObject(out, obj.elemManifest.runtimeClass)
+    kser.writeObject(out, obj.elemTag.runtimeClass)
     kser.writeClassAndObject(out, obj.array)
   }