diff --git a/tools/dart/update.py b/tools/dart/update.py
index b830528..349c1ab 100755
--- a/tools/dart/update.py
+++ b/tools/dart/update.py
@@ -18,7 +18,7 @@
 # How to roll the dart sdk: Just change this url! We write this to the stamp
 # file after we download, and then check the stamp file for differences.
 SDK_URL_BASE = ('http://gsdview.appspot.com/dart-archive/channels/dev/raw/'
-                '1.12.0-dev.3.1/sdk/')
+                '1.13.0-dev.0.0/sdk/')
 
 LINUX_64_SDK = 'dartsdk-linux-x64-release.zip'
 MACOS_64_SDK = 'dartsdk-macos-x64-release.zip'