diff --git a/build/build.xml b/build/build.xml
index 139a34c43..b3bc4fd1c 100644
--- a/build/build.xml
+++ b/build/build.xml
@@ -382,7 +382,7 @@
       <param name="unpack_target" value="untar"/>
       <param name="gcc_archive_file" value="avr-gcc-4.8.1-arduino5-i386-apple-darwin11.tar.bz2"/>
       <param name="gcc_version" value="4.8.1-arduino5"/>
-      <param name="avrdude_archive_file" value="avrdude-6.0.1-arduino5-i386-apple-darwin11.tar.bz2"/>
+      <param name="avrdude_archive_file" value="avrdude-6.0.1-arduino5-r2-i386-apple-darwin11.tar.bz2"/>
       <param name="avrdude_version" value="6.0.1-arduino5"/>
     </antcall>
 
@@ -390,6 +390,11 @@
       <fileset dir="${staging_folder}/work/${staging_hardware_folder}/tools" includes="**/bin/*"/>
       <fileset dir="${staging_folder}/work/${staging_hardware_folder}/tools" includes="**/libexec/gcc/avr/4.8.1/*"/>
     </chmod>
+
+    <!-- macosx gatekeeper workaround. See https://github.com/arduino/Arduino/issues/3468 -->
+    <chmod perm="-x">
+      <fileset dir="${staging_folder}/work/${staging_hardware_folder}/tools" includes="**/bin/avrdude_bin" />
+    </chmod>
   </target>
 
   <target name="macosx-run" depends="build" description="Run Mac OS X version">
diff --git a/build/macosx/avrdude-6.0.1-arduino5-r2-i386-apple-darwin11.tar.bz2.sha b/build/macosx/avrdude-6.0.1-arduino5-r2-i386-apple-darwin11.tar.bz2.sha
new file mode 100644
index 000000000..3b1625eee
--- /dev/null
+++ b/build/macosx/avrdude-6.0.1-arduino5-r2-i386-apple-darwin11.tar.bz2.sha
@@ -0,0 +1 @@
+52afce6cbe1cc1021bca1234cf25b298350f97dd
diff --git a/build/shared/revisions.txt b/build/shared/revisions.txt
index ce1ebe5bf..d465203e0 100644
--- a/build/shared/revisions.txt
+++ b/build/shared/revisions.txt
@@ -22,6 +22,11 @@ ARDUINO 1.6.6
 * Bridge: YunClient.connected() returns true if there are bytes available for read. Thanks @RobAtticus
 * Bridge: YunClient.stop() now empties all buffers. Thanks @RobAtticus
 
+ARDUINO 1.6.5-r3 - 2015.07.20
+
+[ide]
+* Fixed Mac signature for OSX >=10.10.4
+
 ARDUINO 1.6.5-r2 - 2015.06.17
 
 [ide]