diff --git a/build/build.xml b/build/build.xml
index 8cd4446a7..45727f97b 100644
--- a/build/build.xml
+++ b/build/build.xml
@@ -275,13 +275,13 @@
     <mkdir dir="${staging_folder}/work" />
 
     <antcall target="unzip">
-      <param name="archive_file" value="${staging_folder}/appbundler-1.0ea-arduino3.jar.zip" />
-      <param name="archive_url" value="http://downloads.arduino.cc/appbundler-1.0ea-arduino3.jar.zip" />
-      <param name="final_folder" value="${staging_folder}/appbundler-1.0ea-arduino3" />
-      <param name="dest_folder" value="${staging_folder}/appbundler-1.0ea-arduino3" />
+      <param name="archive_file" value="${staging_folder}/appbundler-1.0ea-arduino4.jar.zip" />
+      <param name="archive_url" value="http://downloads.arduino.cc/appbundler-1.0ea-arduino4.jar.zip" />
+      <param name="final_folder" value="${staging_folder}/appbundler-1.0ea-arduino4" />
+      <param name="dest_folder" value="${staging_folder}/appbundler-1.0ea-arduino4" />
     </antcall>
 
-    <taskdef name="bundleapp" classname="com.oracle.appbundler.AppBundlerTask" classpath="${staging_folder}/appbundler-1.0ea-arduino3/appbundler-1.0ea-arduino3.jar"/>
+    <taskdef name="bundleapp" classname="com.oracle.appbundler.AppBundlerTask" classpath="${staging_folder}/appbundler-1.0ea-arduino4/appbundler-1.0ea-arduino4.jar"/>
 
     <bundleapp
             jvmRequired="1.8"
@@ -314,6 +314,7 @@
       <option value="-Dcom.apple.smallTabs=true"/>
       <option value="-Dcom.apple.macos.useScreenMenuBar=true"/>
       <option value="-DAPP_DIR=$APP_ROOT/Contents/Java"/>
+      <option value="-Djava.ext.dirs=$JVM_RUNTIME/Contents/Home/jre/lib/ext/"/>
 
       <!--
       <option value="-Dapple.awt.showGrowBox=false"/>
diff --git a/build/macosx/appbundler-1.0ea-arduino3.jar.zip.sha b/build/macosx/appbundler-1.0ea-arduino3.jar.zip.sha
deleted file mode 100644
index 71aec86b5..000000000
--- a/build/macosx/appbundler-1.0ea-arduino3.jar.zip.sha
+++ /dev/null
@@ -1 +0,0 @@
-247d19a71672171ce2eda25704121375f04c5e1f
diff --git a/build/macosx/appbundler-1.0ea-arduino4.jar.zip.sha b/build/macosx/appbundler-1.0ea-arduino4.jar.zip.sha
new file mode 100644
index 000000000..15cbc3db3
--- /dev/null
+++ b/build/macosx/appbundler-1.0ea-arduino4.jar.zip.sha
@@ -0,0 +1 @@
+89ef9e3ab1572e0bf2edfae2c9d6c0a03dcf2665