diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 1f621e34..29bc0fbc 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="at.bitfire.davdroid"
-    android:versionCode="41"
-    android:versionName="0.6.3" android:installLocation="internalOnly">
+    android:versionCode="42"
+    android:versionName="0.6.4" android:installLocation="internalOnly">
 
     <uses-sdk
         android:minSdkVersion="14"
diff --git a/libs/ez-vcard-0.9.5.jar b/libs/ez-vcard-0.9.6.jar
similarity index 67%
rename from libs/ez-vcard-0.9.5.jar
rename to libs/ez-vcard-0.9.6.jar
index 2ad7bf2e..0bb07c9d 100644
Binary files a/libs/ez-vcard-0.9.5.jar and b/libs/ez-vcard-0.9.6.jar differ
diff --git a/libs/ical4j-1.0.5.2.jar b/libs/ical4j-1.0.6-davdroid141027.jar
similarity index 60%
rename from libs/ical4j-1.0.5.2.jar
rename to libs/ical4j-1.0.6-davdroid141027.jar
index f4a763eb..6a6ec1bf 100644
Binary files a/libs/ical4j-1.0.5.2.jar and b/libs/ical4j-1.0.6-davdroid141027.jar differ
diff --git a/src/at/bitfire/davdroid/Constants.java b/src/at/bitfire/davdroid/Constants.java
index caa181d0..96c1c7b1 100644
--- a/src/at/bitfire/davdroid/Constants.java
+++ b/src/at/bitfire/davdroid/Constants.java
@@ -9,7 +9,7 @@ package at.bitfire.davdroid;
 
 public class Constants {
 	public static final String
-		APP_VERSION = "0.6.3",
+		APP_VERSION = "0.6.4",
 		ACCOUNT_TYPE = "bitfire.at.davdroid",
 		WEB_URL_HELP = "http://davdroid.bitfire.at/configuration?pk_campaign=davdroid-app",
 		
diff --git a/src/at/bitfire/davdroid/resource/Event.java b/src/at/bitfire/davdroid/resource/Event.java
index 59df4baa..07b7bc43 100644
--- a/src/at/bitfire/davdroid/resource/Event.java
+++ b/src/at/bitfire/davdroid/resource/Event.java
@@ -203,7 +203,7 @@ public class Event extends Resource {
 	public ByteArrayOutputStream toEntity() throws IOException {
 		net.fortuna.ical4j.model.Calendar ical = new net.fortuna.ical4j.model.Calendar();
 		ical.getProperties().add(Version.VERSION_2_0);
-		ical.getProperties().add(new ProdId("-//bitfire web engineering//DAVdroid " + Constants.APP_VERSION + "//EN"));
+		ical.getProperties().add(new ProdId("-//bitfire web engineering//DAVdroid " + Constants.APP_VERSION + " (ical4j 1.0.x)//EN"));
 		
 		VEvent event = new VEvent();
 		PropertyList props = event.getProperties();
diff --git a/src/ical4j.properties b/src/ical4j.properties
index 66f4ba5e..6db152a4 100644
--- a/src/ical4j.properties
+++ b/src/ical4j.properties
@@ -1,4 +1,6 @@
 
+net.fortuna.ical4j.timezone.update.enabled=false
+
 ical4j.unfolding.relaxed=true
 ical4j.parsing.relaxed=true
 ical4j.compatibility.outlook=true