diff --git a/browser/config/version.txt b/browser/config/version.txt
index b074f2c69e9c..fdbc61c20daa 100644
--- a/browser/config/version.txt
+++ b/browser/config/version.txt
@@ -1 +1 @@
-4.0b2pre
+4.0b3pre
diff --git a/config/milestone.txt b/config/milestone.txt
index c3ef4428bf38..eaf5d6510e53 100644
--- a/config/milestone.txt
+++ b/config/milestone.txt
@@ -10,4 +10,4 @@
 # hardcoded milestones in the tree from these two files.
 #--------------------------------------------------------
 
-2.0b2pre
+2.0b3pre
diff --git a/js/src/config/milestone.txt b/js/src/config/milestone.txt
index c3ef4428bf38..eaf5d6510e53 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.
 #--------------------------------------------------------
 
-2.0b2pre
+2.0b3pre