diff --git a/CLOBBER b/CLOBBER
index 496b9854d3ff..2a966c8a83f8 100644
--- a/CLOBBER
+++ b/CLOBBER
@@ -22,4 +22,4 @@
 # changes to stick? As of bug 928195, this shouldn't be necessary! Please
 # don't change CLOBBER for WebIDL changes any more.
 
-Merge day clobber 2024-08-05
\ No newline at end of file
+Merge day clobber 2024-09-02
\ No newline at end of file
diff --git a/browser/config/version.txt b/browser/config/version.txt
index 39a298ab41c4..f3650d643928 100644
--- a/browser/config/version.txt
+++ b/browser/config/version.txt
@@ -1 +1 @@
-128.2.0
+128.3.0
diff --git a/browser/config/version_display.txt b/browser/config/version_display.txt
index 0882f9276727..bef17c0efc5f 100644
--- a/browser/config/version_display.txt
+++ b/browser/config/version_display.txt
@@ -1 +1 @@
-128.2.0esr
+128.3.0esr
diff --git a/config/milestone.txt b/config/milestone.txt
index 8ced5623c498..58c8720643c1 100644
--- a/config/milestone.txt
+++ b/config/milestone.txt
@@ -10,4 +10,4 @@
 # hardcoded milestones in the tree from these two files.
 #--------------------------------------------------------
 
-128.2.0
+128.3.0