diff --git a/.arcconfig b/.arcconfig
index 27dc4285d80f..4e33250c9867 100644
--- a/.arcconfig
+++ b/.arcconfig
@@ -1,5 +1,5 @@
 {
   "phabricator.uri" : "https://phabricator.services.mozilla.com/",
-  "repository.callsign": "FIREFOXRELEASE",
+  "repository.callsign": "FIREFOXESRONEFOURZERO",
   "history.immutable": false
 }
diff --git a/CLOBBER b/CLOBBER
index 05a06dbe772b..0715276a44fe 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 2025-06-16
\ No newline at end of file
+Merge day clobber 2025-06-17
\ No newline at end of file