diff --git a/CLOBBER b/CLOBBER
index 617f30368247..d1b71bfe472a 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.
 
-Removed proxying objects - Bug 1878638: Remove handle duplication rules for Windows process sandboxes
+Merge day clobber 2024-03-18
\ No newline at end of file
diff --git a/browser/config/version.txt b/browser/config/version.txt
index eae6fa023384..f24f0d3e085b 100644
--- a/browser/config/version.txt
+++ b/browser/config/version.txt
@@ -1 +1 @@
-125.0a1
+126.0a1
diff --git a/browser/config/version_display.txt b/browser/config/version_display.txt
index eae6fa023384..f24f0d3e085b 100644
--- a/browser/config/version_display.txt
+++ b/browser/config/version_display.txt
@@ -1 +1 @@
-125.0a1
+126.0a1
diff --git a/config/milestone.txt b/config/milestone.txt
index 4616e8511e59..ee96586feff6 100644
--- a/config/milestone.txt
+++ b/config/milestone.txt
@@ -10,4 +10,4 @@
 # hardcoded milestones in the tree from these two files.
 #--------------------------------------------------------
 
-125.0a1
+126.0a1
diff --git a/services/sync/modules/constants.sys.mjs b/services/sync/modules/constants.sys.mjs
index 958e3345e60c..9efe941c0ad4 100644
--- a/services/sync/modules/constants.sys.mjs
+++ b/services/sync/modules/constants.sys.mjs
@@ -4,7 +4,7 @@
 
 // Don't manually modify this line, as it is automatically replaced on merge day
 // by the gecko_migration.py script.
-export const WEAVE_VERSION = "1.127.0";
+export const WEAVE_VERSION = "1.128.0";
 
 // Sync Server API version that the client supports.
 export const SYNC_API_VERSION = "1.5";