diff --git a/app/build.gradle b/app/build.gradle
index a2613c7a..04cd740c 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -80,6 +80,7 @@ dependencies {
     compile 'com.github.yukuku:ambilwarna:2.0.1'
 
     compile 'com.squareup.okhttp3:logging-interceptor:3.5.0'
+    compile 'commons-io:commons-io:2.5'
     compile 'dnsjava:dnsjava:2.1.7'
     compile 'org.apache.commons:commons-lang3:3.4'
     compile 'org.apache.commons:commons-collections4:4.1'
diff --git a/app/src/main/java/at/bitfire/davdroid/syncadapter/ContactsSyncManager.java b/app/src/main/java/at/bitfire/davdroid/syncadapter/ContactsSyncManager.java
index 7ef9a5f6..6ac1bcec 100644
--- a/app/src/main/java/at/bitfire/davdroid/syncadapter/ContactsSyncManager.java
+++ b/app/src/main/java/at/bitfire/davdroid/syncadapter/ContactsSyncManager.java
@@ -25,6 +25,7 @@ import android.text.TextUtils;
 
 import org.apache.commons.codec.Charsets;
 import org.apache.commons.collections4.SetUtils;
+import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang3.StringUtils;
 
 import java.io.ByteArrayInputStream;
@@ -67,7 +68,6 @@ import at.bitfire.vcard4android.Contact;
 import at.bitfire.vcard4android.ContactsStorageException;
 import at.bitfire.vcard4android.GroupMethod;
 import ezvcard.VCardVersion;
-import ezvcard.util.IOUtils;
 import lombok.Cleanup;
 import lombok.RequiredArgsConstructor;
 import okhttp3.HttpUrl;
diff --git a/app/src/main/java/at/bitfire/davdroid/ui/AboutActivity.java b/app/src/main/java/at/bitfire/davdroid/ui/AboutActivity.java
index 242f0cfa..08fa2ae7 100644
--- a/app/src/main/java/at/bitfire/davdroid/ui/AboutActivity.java
+++ b/app/src/main/java/at/bitfire/davdroid/ui/AboutActivity.java
@@ -30,6 +30,7 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.TextView;
 
+import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang3.time.DateFormatUtils;
 
 import java.io.IOException;
@@ -40,7 +41,6 @@ import at.bitfire.davdroid.App;
 import at.bitfire.davdroid.BuildConfig;
 import at.bitfire.davdroid.R;
 import ezvcard.Ezvcard;
-import ezvcard.util.IOUtils;
 import lombok.Cleanup;
 import lombok.RequiredArgsConstructor;
 
diff --git a/vcard4android b/vcard4android
index 20733b17..628ef73f 160000
--- a/vcard4android
+++ b/vcard4android
@@ -1 +1 @@
-Subproject commit 20733b17bce7ec08f978a58d0204119f844b1a28
+Subproject commit 628ef73fa72bde2d8e4a3326b9683b58bbe11c8b