diff --git a/browser/app/module.ver b/browser/app/module.ver
index 597f73df161..6286ea78d4e 100644
--- a/browser/app/module.ver
+++ b/browser/app/module.ver
@@ -1,7 +1,7 @@
 WIN32_MODULE_COMPANYNAME=Mozilla Corporation
 WIN32_MODULE_COPYRIGHT=©Firefox and Mozilla Developers, according to the MPL 1.1/GPL 2.0/LGPL 2.1 licenses, as applicable.
 WIN32_MODULE_PRODUCTVERSION=3,1,0,0
-WIN32_MODULE_PRODUCTVERSION_STRING=3.1b1pre
+WIN32_MODULE_PRODUCTVERSION_STRING=3.1b2pre
 WIN32_MODULE_TRADEMARKS=Firefox is a Trademark of The Mozilla Foundation.
 WIN32_MODULE_DESCRIPTION=Firefox
 WIN32_MODULE_PRODUCTNAME=Firefox
diff --git a/browser/config/version.txt b/browser/config/version.txt
index 1cb9c782d36..df457964e59 100644
--- a/browser/config/version.txt
+++ b/browser/config/version.txt
@@ -1 +1 @@
-3.1b1pre
+3.1b2pre
diff --git a/config/milestone.txt b/config/milestone.txt
index f9801c0b3f5..6aa60ce86d1 100644
--- a/config/milestone.txt
+++ b/config/milestone.txt
@@ -10,4 +10,4 @@
 # hardcoded milestones in the tree from these two files.
 #--------------------------------------------------------
 
-1.9.1b1pre
+1.9.1b2pre