diff --git a/build/arduino-builder-linux32-1.4.4.tar.bz2.sha b/build/arduino-builder-linux32-1.4.4.tar.bz2.sha
deleted file mode 100644
index c95c546972a..00000000000
--- a/build/arduino-builder-linux32-1.4.4.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-b921835888c5bf4ad07c10b5e2e19a975528e380
diff --git a/build/arduino-builder-linux32-1.4.5.tar.bz2.sha b/build/arduino-builder-linux32-1.4.5.tar.bz2.sha
new file mode 100644
index 00000000000..f3a5551353b
--- /dev/null
+++ b/build/arduino-builder-linux32-1.4.5.tar.bz2.sha
@@ -0,0 +1 @@
+2a45e470b163c5962aa7aa5531964855ae966f1b
diff --git a/build/arduino-builder-linux64-1.4.4.tar.bz2.sha b/build/arduino-builder-linux64-1.4.4.tar.bz2.sha
deleted file mode 100644
index a8110a412cf..00000000000
--- a/build/arduino-builder-linux64-1.4.4.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-d9e5fdd0f73d8f62504abddc071dcb6f660c8b6e
diff --git a/build/arduino-builder-linux64-1.4.5.tar.bz2.sha b/build/arduino-builder-linux64-1.4.5.tar.bz2.sha
new file mode 100644
index 00000000000..4c6f083ae46
--- /dev/null
+++ b/build/arduino-builder-linux64-1.4.5.tar.bz2.sha
@@ -0,0 +1 @@
+bce6002b0edc86b41f6a3dfc6b9e6a172cdc6b4c
diff --git a/build/arduino-builder-linuxaarch64-1.4.4.tar.bz2.sha b/build/arduino-builder-linuxaarch64-1.4.4.tar.bz2.sha
deleted file mode 100644
index 6ce781c873e..00000000000
--- a/build/arduino-builder-linuxaarch64-1.4.4.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-9ff8b48d3f61e40ecff4bf2e7c14e312302290d7
diff --git a/build/arduino-builder-linuxaarch64-1.4.5.tar.bz2.sha b/build/arduino-builder-linuxaarch64-1.4.5.tar.bz2.sha
new file mode 100644
index 00000000000..051dc4f794d
--- /dev/null
+++ b/build/arduino-builder-linuxaarch64-1.4.5.tar.bz2.sha
@@ -0,0 +1 @@
+d053ef6ee7b544d31dda243a379053e23a1b287f
diff --git a/build/arduino-builder-linuxarm-1.4.4.tar.bz2.sha b/build/arduino-builder-linuxarm-1.4.4.tar.bz2.sha
deleted file mode 100644
index 9ce328cfa69..00000000000
--- a/build/arduino-builder-linuxarm-1.4.4.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-19beb0ed3f1dea919b33d7defbe1b05414b69f2b
diff --git a/build/arduino-builder-linuxarm-1.4.5.tar.bz2.sha b/build/arduino-builder-linuxarm-1.4.5.tar.bz2.sha
new file mode 100644
index 00000000000..ce2c1fee42b
--- /dev/null
+++ b/build/arduino-builder-linuxarm-1.4.5.tar.bz2.sha
@@ -0,0 +1 @@
+0164aa7ca0db10c1d2da4094d2036608acaf5895
diff --git a/build/arduino-builder-macosx-1.4.4.tar.bz2.sha b/build/arduino-builder-macosx-1.4.4.tar.bz2.sha
deleted file mode 100644
index 50049c75ae7..00000000000
--- a/build/arduino-builder-macosx-1.4.4.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-d7006495131ec609d797c0f049a10fe6156751a3
diff --git a/build/arduino-builder-macosx-1.4.5.tar.bz2.sha b/build/arduino-builder-macosx-1.4.5.tar.bz2.sha
new file mode 100644
index 00000000000..5f391a42700
--- /dev/null
+++ b/build/arduino-builder-macosx-1.4.5.tar.bz2.sha
@@ -0,0 +1 @@
+991f6f0958d44b183dba1f53ac13a53c8e61cbd1
diff --git a/build/arduino-builder-windows-1.4.4.zip.sha b/build/arduino-builder-windows-1.4.4.zip.sha
deleted file mode 100644
index 532e9b55e2f..00000000000
--- a/build/arduino-builder-windows-1.4.4.zip.sha
+++ /dev/null
@@ -1 +0,0 @@
-7cc958e5e96c26408b7396ecf63688eb25894c2c
diff --git a/build/arduino-builder-windows-1.4.5.zip.sha b/build/arduino-builder-windows-1.4.5.zip.sha
new file mode 100644
index 00000000000..8639e12348a
--- /dev/null
+++ b/build/arduino-builder-windows-1.4.5.zip.sha
@@ -0,0 +1 @@
+049fc8ecbc4d839252ede8bc92f0cd9468ac4891
diff --git a/build/avr-1.6.23.tar.bz2.sha b/build/avr-1.6.23.tar.bz2.sha
deleted file mode 100644
index 22fcd20b8be..00000000000
--- a/build/avr-1.6.23.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-3a9383f3f2c8071e024a05b14fb4175e4eb140f6
diff --git a/build/avr-1.8.1.tar.bz2.sha b/build/avr-1.8.1.tar.bz2.sha
new file mode 100644
index 00000000000..00b3dab6dda
--- /dev/null
+++ b/build/avr-1.8.1.tar.bz2.sha
@@ -0,0 +1 @@
+4a5f3e31e0f76c7c3409326053a2b26b9f7bf74d
diff --git a/build/build.xml b/build/build.xml
index 1e034b11274..a2d22899bb7 100644
--- a/build/build.xml
+++ b/build/build.xml
@@ -99,12 +99,12 @@
 
   <property name="portable" value="false" />
 
-  <property name="ARDUINO-BUILDER-VERSION" value="1.4.4" />
+  <property name="ARDUINO-BUILDER-VERSION" value="1.4.5" />
   <property name="LIBLISTSERIAL-VERSION" value="1.4.2" />
-  <property name="AVRGCC-VERSION" value="5.4.0-atmel3.6.1-arduino2" />
-  <property name="AVRDUDE-VERSION" value="6.3.0-arduino14" />
-  <property name="AVRCORE-VERSION" value="1.6.23" />
-  <property name="arduinoOTA-VERSION" value="1.2.1" />
+  <property name="AVRGCC-VERSION" value="7.3.0-atmel3.6.1-arduino5" />
+  <property name="AVRDUDE-VERSION" value="6.3.0-arduino17" />
+  <property name="AVRCORE-VERSION" value="1.8.1" />
+  <property name="arduinoOTA-VERSION" value="1.3.0" />
 
   <!-- Libraries required for running arduino -->
   <fileset dir=".." id="runtime.jars">
@@ -218,8 +218,8 @@
 
     <!-- Add WiFi101 updater tool -->
     <antcall target="unzip">
-      <param name="archive_file" value="shared/WiFi101-Updater-ArduinoIDE-Plugin-0.10.8.zip" />
-      <param name="archive_url" value="https://github.com/arduino-libraries/WiFi101-FirmwareUpdater-Plugin/releases/download/v0.10.8/WiFi101-Updater-ArduinoIDE-Plugin-0.10.8.zip" />
+      <param name="archive_file" value="shared/WiFi101-Updater-ArduinoIDE-Plugin-0.10.9.zip" />
+      <param name="archive_url" value="https://github.com/arduino-libraries/WiFi101-FirmwareUpdater-Plugin/releases/download/v0.10.9/WiFi101-Updater-ArduinoIDE-Plugin-0.10.9.zip" />
       <param name="final_folder" value="${target.path}/tools/WiFi101" />
       <param name="dest_folder" value="${target.path}/tools/" />
     </antcall>
@@ -513,9 +513,9 @@
   <target name="macosx-build-avr-toolchain" unless="light_bundle">
     <antcall target="avr-toolchain-bundle">
       <param name="unpack_target" value="untar-native"/>
-      <param name="gcc_archive_file" value="avr-gcc-${AVRGCC-VERSION}-i386-apple-darwin11.tar.bz2"/>
+      <param name="gcc_archive_file" value="avr-gcc-${AVRGCC-VERSION}-x86_64-apple-darwin14.tar.bz2"/>
       <param name="gcc_version" value="${AVRGCC-VERSION}"/>
-      <param name="avrdude_archive_file" value="avrdude-${AVRDUDE-VERSION}-i386-apple-darwin11.tar.bz2"/>
+      <param name="avrdude_archive_file" value="avrdude-${AVRDUDE-VERSION}-x86_64-apple-darwin12.tar.bz2"/>
       <param name="avrdude_version" value="${AVRDUDE-VERSION}"/>
       <param name="arduinoOTA_archive_file" value="arduinoOTA-${arduinoOTA-VERSION}-darwin_amd64.tar.bz2"/>
       <param name="arduinoOTA_version" value="${arduinoOTA-VERSION}"/>
@@ -726,7 +726,7 @@
 
     <antcall target="avr-toolchain-bundle">
       <param name="unpack_target" value="untar-native"/>
-      <param name="gcc_archive_file" value="avr-gcc-${AVRGCC-VERSION}-armhf-pc-linux-gnu.tar.bz2"/>
+      <param name="gcc_archive_file" value="avr-gcc-${AVRGCC-VERSION}-arm-linux-gnueabihf.tar.bz2"/>
       <param name="gcc_version" value="${AVRGCC-VERSION}"/>
       <param name="avrdude_archive_file" value="avrdude-${AVRDUDE-VERSION}-armhf-pc-linux-gnu.tar.bz2"/>
       <param name="avrdude_version" value="${AVRDUDE-VERSION}"/>
diff --git a/build/linux/arduinoOTA-1.3.0-linux_386.tar.bz2.sha b/build/linux/arduinoOTA-1.3.0-linux_386.tar.bz2.sha
new file mode 100644
index 00000000000..1d097895882
--- /dev/null
+++ b/build/linux/arduinoOTA-1.3.0-linux_386.tar.bz2.sha
@@ -0,0 +1 @@
+21848a41ecbec2fa2fa44e5c5402ff641d60a179
diff --git a/build/linux/arduinoOTA-1.3.0-linux_amd64.tar.bz2.sha b/build/linux/arduinoOTA-1.3.0-linux_amd64.tar.bz2.sha
new file mode 100644
index 00000000000..1f677cf5fd4
--- /dev/null
+++ b/build/linux/arduinoOTA-1.3.0-linux_amd64.tar.bz2.sha
@@ -0,0 +1 @@
+6c7b86b96a2f02042a1595ec097b127345767a7d
diff --git a/build/linux/arduinoOTA-1.3.0-linux_arm.tar.bz2.sha b/build/linux/arduinoOTA-1.3.0-linux_arm.tar.bz2.sha
new file mode 100644
index 00000000000..7d19155c9ba
--- /dev/null
+++ b/build/linux/arduinoOTA-1.3.0-linux_arm.tar.bz2.sha
@@ -0,0 +1 @@
+03f63bd8e4298d43f60bec17d4f982db9790854a
diff --git a/build/linux/arduinoOTA-1.3.0-linux_arm64.tar.bz2.sha b/build/linux/arduinoOTA-1.3.0-linux_arm64.tar.bz2.sha
new file mode 100644
index 00000000000..5b87f601639
--- /dev/null
+++ b/build/linux/arduinoOTA-1.3.0-linux_arm64.tar.bz2.sha
@@ -0,0 +1 @@
+e8cced0815cb5dd2a9e1ba18a0a85f275a5d5d9e
diff --git a/build/linux/avr-gcc-7.3.0-atmel3.6.1-arduino5-aarch64-pc-linux-gnu.tar.bz2.sha b/build/linux/avr-gcc-7.3.0-atmel3.6.1-arduino5-aarch64-pc-linux-gnu.tar.bz2.sha
new file mode 100644
index 00000000000..023275eecb3
--- /dev/null
+++ b/build/linux/avr-gcc-7.3.0-atmel3.6.1-arduino5-aarch64-pc-linux-gnu.tar.bz2.sha
@@ -0,0 +1 @@
+13e5a5b6aa493e2e81e55fc841185cbd99a1c17e
diff --git a/build/linux/avr-gcc-7.3.0-atmel3.6.1-arduino5-arm-linux-gnueabihf.tar.bz2.sha b/build/linux/avr-gcc-7.3.0-atmel3.6.1-arduino5-arm-linux-gnueabihf.tar.bz2.sha
new file mode 100644
index 00000000000..c99f24e5aeb
--- /dev/null
+++ b/build/linux/avr-gcc-7.3.0-atmel3.6.1-arduino5-arm-linux-gnueabihf.tar.bz2.sha
@@ -0,0 +1 @@
+5f0590f3f7b9279ed3bcac8f4dd8e8f7bffb5a73
diff --git a/build/linux/avr-gcc-7.3.0-atmel3.6.1-arduino5-i686-pc-linux-gnu.tar.bz2.sha b/build/linux/avr-gcc-7.3.0-atmel3.6.1-arduino5-i686-pc-linux-gnu.tar.bz2.sha
new file mode 100644
index 00000000000..c82bdec28ba
--- /dev/null
+++ b/build/linux/avr-gcc-7.3.0-atmel3.6.1-arduino5-i686-pc-linux-gnu.tar.bz2.sha
@@ -0,0 +1 @@
+b7c16cca7784cc5e759e99e17cb61e40df9d8177
diff --git a/build/linux/avr-gcc-7.3.0-atmel3.6.1-arduino5-x86_64-pc-linux-gnu.tar.bz2.sha b/build/linux/avr-gcc-7.3.0-atmel3.6.1-arduino5-x86_64-pc-linux-gnu.tar.bz2.sha
new file mode 100644
index 00000000000..c11c5201f21
--- /dev/null
+++ b/build/linux/avr-gcc-7.3.0-atmel3.6.1-arduino5-x86_64-pc-linux-gnu.tar.bz2.sha
@@ -0,0 +1 @@
+3460e07a73511df2f8f4d0da4e31efe9d0cfa329
diff --git a/build/linux/avrdude-6.3.0-arduino17-aarch64-pc-linux-gnu.tar.bz2.sha b/build/linux/avrdude-6.3.0-arduino17-aarch64-pc-linux-gnu.tar.bz2.sha
new file mode 100644
index 00000000000..6a1b88afa7b
--- /dev/null
+++ b/build/linux/avrdude-6.3.0-arduino17-aarch64-pc-linux-gnu.tar.bz2.sha
@@ -0,0 +1 @@
+b25477ca8719993bc06343aae6a9c67d2c49c8d8
diff --git a/build/linux/avrdude-6.3.0-arduino17-armhf-pc-linux-gnu.tar.bz2.sha b/build/linux/avrdude-6.3.0-arduino17-armhf-pc-linux-gnu.tar.bz2.sha
new file mode 100644
index 00000000000..4fd361ae59e
--- /dev/null
+++ b/build/linux/avrdude-6.3.0-arduino17-armhf-pc-linux-gnu.tar.bz2.sha
@@ -0,0 +1 @@
+1518e80b2e4a9ae433e6b429cd3c299634d2cd60
diff --git a/build/linux/avrdude-6.3.0-arduino17-i686-pc-linux-gnu.tar.bz2.sha b/build/linux/avrdude-6.3.0-arduino17-i686-pc-linux-gnu.tar.bz2.sha
new file mode 100644
index 00000000000..467ecf18c81
--- /dev/null
+++ b/build/linux/avrdude-6.3.0-arduino17-i686-pc-linux-gnu.tar.bz2.sha
@@ -0,0 +1 @@
+66e83e4c8297cdaa5cfb49924c9034140f544ddf
diff --git a/build/linux/avrdude-6.3.0-arduino17-x86_64-pc-linux-gnu.tar.bz2.sha b/build/linux/avrdude-6.3.0-arduino17-x86_64-pc-linux-gnu.tar.bz2.sha
new file mode 100644
index 00000000000..348aaccc823
--- /dev/null
+++ b/build/linux/avrdude-6.3.0-arduino17-x86_64-pc-linux-gnu.tar.bz2.sha
@@ -0,0 +1 @@
+d98ed13ef192cea946e0c7a3e5d8608915625bfe
diff --git a/build/macosx/arduinoOTA-1.3.0-darwin_amd64.tar.bz2.sha b/build/macosx/arduinoOTA-1.3.0-darwin_amd64.tar.bz2.sha
new file mode 100644
index 00000000000..ed003d82f4e
--- /dev/null
+++ b/build/macosx/arduinoOTA-1.3.0-darwin_amd64.tar.bz2.sha
@@ -0,0 +1 @@
+2a2dd53e4d42256106157e0de9b0c72935c45c29
diff --git a/build/macosx/avr-gcc-7.3.0-atmel3.6.1-arduino5-x86_64-apple-darwin14.tar.bz2.sha b/build/macosx/avr-gcc-7.3.0-atmel3.6.1-arduino5-x86_64-apple-darwin14.tar.bz2.sha
new file mode 100644
index 00000000000..ede9bf723a7
--- /dev/null
+++ b/build/macosx/avr-gcc-7.3.0-atmel3.6.1-arduino5-x86_64-apple-darwin14.tar.bz2.sha
@@ -0,0 +1 @@
+40ced394dff8ec5381b7cf3708b2ab8dea54a1f6
diff --git a/build/macosx/avrdude-6.3.0-arduino17-x86_64-apple-darwin12.tar.bz2.sha b/build/macosx/avrdude-6.3.0-arduino17-x86_64-apple-darwin12.tar.bz2.sha
new file mode 100644
index 00000000000..fac5ac8f193
--- /dev/null
+++ b/build/macosx/avrdude-6.3.0-arduino17-x86_64-apple-darwin12.tar.bz2.sha
@@ -0,0 +1 @@
+dfb2a2a4d380c7fc0dc8e141555ae6c028786a8e
diff --git a/build/shared/WiFi101-Updater-ArduinoIDE-Plugin-0.10.8.zip.sha b/build/shared/WiFi101-Updater-ArduinoIDE-Plugin-0.10.8.zip.sha
deleted file mode 100644
index b07e9b460e9..00000000000
--- a/build/shared/WiFi101-Updater-ArduinoIDE-Plugin-0.10.8.zip.sha
+++ /dev/null
@@ -1 +0,0 @@
-5ffdba176b6c2df8c62dc0199f8d0256c82f3053
diff --git a/build/shared/WiFi101-Updater-ArduinoIDE-Plugin-0.10.9.zip.sha b/build/shared/WiFi101-Updater-ArduinoIDE-Plugin-0.10.9.zip.sha
new file mode 100644
index 00000000000..62a8bb3a3c9
--- /dev/null
+++ b/build/shared/WiFi101-Updater-ArduinoIDE-Plugin-0.10.9.zip.sha
@@ -0,0 +1 @@
+27d983813536b2d7fe84913e4fb2ef5cdef62a1b
diff --git a/build/windows/arduinoOTA-1.3.0-windows_386.zip.sha b/build/windows/arduinoOTA-1.3.0-windows_386.zip.sha
new file mode 100644
index 00000000000..c2ee71136ea
--- /dev/null
+++ b/build/windows/arduinoOTA-1.3.0-windows_386.zip.sha
@@ -0,0 +1 @@
+7044265e8ebf00ad55655e4b0eb0d2c3330e9391
diff --git a/build/windows/avr-gcc-7.3.0-atmel3.6.1-arduino5-i686-w64-mingw32.zip.sha b/build/windows/avr-gcc-7.3.0-atmel3.6.1-arduino5-i686-w64-mingw32.zip.sha
new file mode 100644
index 00000000000..ce90c8a11bd
--- /dev/null
+++ b/build/windows/avr-gcc-7.3.0-atmel3.6.1-arduino5-i686-w64-mingw32.zip.sha
@@ -0,0 +1 @@
+488e99b0d5c687823bf4d1a26af0d237eafa20f4
diff --git a/build/windows/avrdude-6.3.0-arduino17-i686-w64-mingw32.zip.sha b/build/windows/avrdude-6.3.0-arduino17-i686-w64-mingw32.zip.sha
new file mode 100644
index 00000000000..19f0fefa34c
--- /dev/null
+++ b/build/windows/avrdude-6.3.0-arduino17-i686-w64-mingw32.zip.sha
@@ -0,0 +1 @@
+e3209cba2453fbf76e1ef0a478dec4010cf1ef8e
diff --git a/hardware/package_index_bundled.json b/hardware/package_index_bundled.json
index abc3ff2745c..926654b1cce 100644
--- a/hardware/package_index_bundled.json
+++ b/hardware/package_index_bundled.json
@@ -12,15 +12,15 @@
         {
           "name": "Arduino AVR Boards",
           "architecture": "avr",
-          "version": "1.6.23",
+          "version": "1.8.1",
           "category": "Arduino",
           "help": {
             "online": "http://www.arduino.cc/en/Reference/HomePage"
           },
-          "url": "http://downloads.arduino.cc/cores/avr-1.6.23.tar.bz2",
-          "archiveFileName": "avr-1.6.23.tar.bz2",
-          "checksum": "SHA-256:18618d7f256f26cd77c35f4c888d5d1b2334f07925094fdc99ac3188722284aa",
-          "size": "5001988",
+          "url": "http://downloads.arduino.cc/cores/avr-1.8.1.tar.bz2",
+          "archiveFileName": "avr-1.8.1.tar.bz2",
+          "checksum": "SHA-256:4791a52fd058f72557af333abc2dea564c8be47fb38fbd7be75ce2fcfdc214b5",
+          "size": "4941605",
           "boards": [
             {"name": "Arduino Yún"},
             {"name": "Arduino/Genuino Uno"},
@@ -53,17 +53,17 @@
             {
               "packager": "arduino",
               "name": "avr-gcc",
-              "version": "5.4.0-atmel3.6.1-arduino2"
+              "version": "7.3.0-atmel3.6.1-arduino5"
             },
             {
               "packager": "arduino",
               "name": "avrdude",
-              "version": "6.3.0-arduino14"
+              "version": "6.3.0-arduino17"
             },
             {
               "packager": "arduino",
               "name": "arduinoOTA",
-              "version": "1.2.1"
+              "version": "1.3.0"
             }
           ]
         }
@@ -71,145 +71,145 @@
       "tools": [
         {
           "name": "avr-gcc",
-          "version": "5.4.0-atmel3.6.1-arduino2",
+          "version": "7.3.0-atmel3.6.1-arduino5",
           "systems": [
             {
-              "size": "31449123",
-              "checksum": "SHA-256:6741f95cc3182a8729cf9670eb13d8dc5a19e881639ca61e53a2d78346a4e99f",
+              "size": "34462042",
+              "checksum": "SHA-256:f4acd5531c6b82c715e2edfa0aadb13fb718b4095b3ea1aa1f7fbde680069639",
               "host": "arm-linux-gnueabihf",
-              "archiveFileName": "avr-gcc-5.4.0-atmel3.6.1-arduino2-armhf-pc-linux-gnu.tar.bz2",
-              "url": "http://downloads.arduino.cc/tools/avr-gcc-5.4.0-atmel3.6.1-arduino2-armhf-pc-linux-gnu.tar.bz2"
+              "archiveFileName": "avr-gcc-7.3.0-atmel3.6.1-arduino5-arm-linux-gnueabihf.tar.bz2",
+              "url": "http://downloads.arduino.cc/tools/avr-gcc-7.3.0-atmel3.6.1-arduino5-arm-linux-gnueabihf.tar.bz2"
             },
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