diff --git a/lib/config/definitions.js b/lib/config/definitions.js
index f5753bfad263c7680561fcd952c1be4c8798a0d3..49874e47ebb299be422e569eaea8b789ccf39965 100644
--- a/lib/config/definitions.js
+++ b/lib/config/definitions.js
@@ -818,6 +818,7 @@ const options = [
       schedule: [],
       masterIssueApproval: false,
       rangeStrategy: 'update-lockfile',
+      branchTopic: '{{{manager}}}-{{{depName}}}-vulnerability',
       commitMessageSuffix: '[SECURITY]',
     },
     cli: false,