diff --git a/renovate.json b/renovate.json
index 54f0a79..3c748dd 100644
--- a/renovate.json
+++ b/renovate.json
@@ -11,6 +11,13 @@
   ],
   "baseBranches": ["main", "/^maint\\/.+/"],
   "packageRules": [
+    {
+      "description": "Disable major chart updates for maintenance branches",
+      "matchBaseBranches": ["/^maint\\/.+/"],
+      "matchUpdateTypes": ["major"],
+      "matchFileNames": ["Chart.yaml"],
+      "enabled": false
+    },
     {
       "matchManagers": ["helmv3"],
       "matchUpdateTypes": ["minor", "patch"],