diff --git a/build/arduino-builder-linux32-1.4.5.tar.bz2.sha b/build/arduino-builder-linux32-1.4.5.tar.bz2.sha
deleted file mode 100644
index f3a5551353b..00000000000
--- a/build/arduino-builder-linux32-1.4.5.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-2a45e470b163c5962aa7aa5531964855ae966f1b
diff --git a/build/arduino-builder-linux32-1.4.6.tar.bz2.sha b/build/arduino-builder-linux32-1.4.6.tar.bz2.sha
new file mode 100644
index 00000000000..fae0290634b
--- /dev/null
+++ b/build/arduino-builder-linux32-1.4.6.tar.bz2.sha
@@ -0,0 +1 @@
+9a1902c56d4e354b1c7bf1124f32ba7c2243b0ad
diff --git a/build/arduino-builder-linux64-1.4.5.tar.bz2.sha b/build/arduino-builder-linux64-1.4.5.tar.bz2.sha
deleted file mode 100644
index 4c6f083ae46..00000000000
--- a/build/arduino-builder-linux64-1.4.5.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-bce6002b0edc86b41f6a3dfc6b9e6a172cdc6b4c
diff --git a/build/arduino-builder-linux64-1.4.6.tar.bz2.sha b/build/arduino-builder-linux64-1.4.6.tar.bz2.sha
new file mode 100644
index 00000000000..3ada2db124d
--- /dev/null
+++ b/build/arduino-builder-linux64-1.4.6.tar.bz2.sha
@@ -0,0 +1 @@
+f94c0acc250aff21cdf5d7e6eb676f79f62b18e7
diff --git a/build/arduino-builder-linuxaarch64-1.4.5.tar.bz2.sha b/build/arduino-builder-linuxaarch64-1.4.5.tar.bz2.sha
deleted file mode 100644
index 051dc4f794d..00000000000
--- a/build/arduino-builder-linuxaarch64-1.4.5.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-d053ef6ee7b544d31dda243a379053e23a1b287f
diff --git a/build/arduino-builder-linuxaarch64-1.4.6.tar.bz2.sha b/build/arduino-builder-linuxaarch64-1.4.6.tar.bz2.sha
new file mode 100644
index 00000000000..62d82aad44e
--- /dev/null
+++ b/build/arduino-builder-linuxaarch64-1.4.6.tar.bz2.sha
@@ -0,0 +1 @@
+71f295a3a6ba79b01f0f77c3303111b9a271e32c
diff --git a/build/arduino-builder-linuxarm-1.4.5.tar.bz2.sha b/build/arduino-builder-linuxarm-1.4.5.tar.bz2.sha
deleted file mode 100644
index ce2c1fee42b..00000000000
--- a/build/arduino-builder-linuxarm-1.4.5.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-0164aa7ca0db10c1d2da4094d2036608acaf5895
diff --git a/build/arduino-builder-linuxarm-1.4.6.tar.bz2.sha b/build/arduino-builder-linuxarm-1.4.6.tar.bz2.sha
new file mode 100644
index 00000000000..52d2d323f3a
--- /dev/null
+++ b/build/arduino-builder-linuxarm-1.4.6.tar.bz2.sha
@@ -0,0 +1 @@
+8c609ab8a8574a91dbabaf40d02b74b293150a86
diff --git a/build/arduino-builder-macosx-1.4.5.tar.bz2.sha b/build/arduino-builder-macosx-1.4.5.tar.bz2.sha
deleted file mode 100644
index 5f391a42700..00000000000
--- a/build/arduino-builder-macosx-1.4.5.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-991f6f0958d44b183dba1f53ac13a53c8e61cbd1
diff --git a/build/arduino-builder-macosx-1.4.6.tar.bz2.sha b/build/arduino-builder-macosx-1.4.6.tar.bz2.sha
new file mode 100644
index 00000000000..9bfeac6acde
--- /dev/null
+++ b/build/arduino-builder-macosx-1.4.6.tar.bz2.sha
@@ -0,0 +1 @@
+d59a62bb31c32ef336eaf7840afa7b61c4e991f6
diff --git a/build/arduino-builder-windows-1.4.5.zip.sha b/build/arduino-builder-windows-1.4.5.zip.sha
deleted file mode 100644
index 8639e12348a..00000000000
--- a/build/arduino-builder-windows-1.4.5.zip.sha
+++ /dev/null
@@ -1 +0,0 @@
-049fc8ecbc4d839252ede8bc92f0cd9468ac4891
diff --git a/build/arduino-builder-windows-1.4.6.zip.sha b/build/arduino-builder-windows-1.4.6.zip.sha
new file mode 100644
index 00000000000..b0b52647c3c
--- /dev/null
+++ b/build/arduino-builder-windows-1.4.6.zip.sha
@@ -0,0 +1 @@
+d028fc31fdc6a24f8d4b2528483734946f79b82f
diff --git a/build/arduino-builder.exe.sha b/build/arduino-builder.exe.sha
new file mode 100644
index 00000000000..6f523b8b9da
--- /dev/null
+++ b/build/arduino-builder.exe.sha
@@ -0,0 +1 @@
+4e2a1509e337b94e6ed45e200a20a623836edc80
diff --git a/build/arduino-builder.sha b/build/arduino-builder.sha
new file mode 100644
index 00000000000..cc5fe5caa7e
--- /dev/null
+++ b/build/arduino-builder.sha
@@ -0,0 +1 @@
+4bb78f1449f0c99171144a8607bee5fa35f096e9
diff --git a/build/build.xml b/build/build.xml
index 4210924619d..56fb9ca3b96 100644
--- a/build/build.xml
+++ b/build/build.xml
@@ -99,7 +99,7 @@
 
   <property name="portable" value="false" />
 
-  <property name="ARDUINO-BUILDER-VERSION" value="1.4.5" />
+  <property name="ARDUINO-BUILDER-VERSION" value="1.4.6" />
   <property name="LIBLISTSERIAL-VERSION" value="1.4.2" />
   <property name="AVRGCC-VERSION" value="7.3.0-atmel3.6.1-arduino5" />
   <property name="AVRDUDE-VERSION" value="6.3.0-arduino17" />