diff --git a/browser/config/version.txt b/browser/config/version.txt
index aacda2c8471..203d4093f2a 100644
--- a/browser/config/version.txt
+++ b/browser/config/version.txt
@@ -1 +1 @@
-3.7a2pre
+3.7a3pre
diff --git a/config/milestone.txt b/config/milestone.txt
index 109d0da0708..b38abb3ec7d 100644
--- a/config/milestone.txt
+++ b/config/milestone.txt
@@ -10,4 +10,4 @@
 # hardcoded milestones in the tree from these two files.
 #--------------------------------------------------------
 
-1.9.3a2pre
+1.9.3a3pre
diff --git a/js/src/config/milestone.txt b/js/src/config/milestone.txt
index 109d0da0708..b38abb3ec7d 100644
--- a/js/src/config/milestone.txt
+++ b/js/src/config/milestone.txt
@@ -10,4 +10,4 @@
 # hardcoded milestones in the tree from these two files.
 #--------------------------------------------------------
 
-1.9.3a2pre
+1.9.3a3pre