diff --git a/browser/config/version.txt b/browser/config/version.txt
index 873f9ec36d8..4e3958555ff 100644
--- a/browser/config/version.txt
+++ b/browser/config/version.txt
@@ -1 +1 @@
-4.0b7pre
+4.0b8pre
diff --git a/config/milestone.txt b/config/milestone.txt
index d6e199cd240..181d2a80ff9 100644
--- a/config/milestone.txt
+++ b/config/milestone.txt
@@ -10,4 +10,4 @@
 # hardcoded milestones in the tree from these two files.
 #--------------------------------------------------------
 
-2.0b7pre
+2.0b8pre
diff --git a/js/src/config/milestone.txt b/js/src/config/milestone.txt
index d6e199cd240..181d2a80ff9 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.
 #--------------------------------------------------------
 
-2.0b7pre
+2.0b8pre