diff --git a/values/namecheap-webhook/manifests/namecheap-webhook.yaml b/values/namecheap-webhook/manifests/namecheap-webhook.yaml
index 282c4fa9..43034c08 100644
--- a/values/namecheap-webhook/manifests/namecheap-webhook.yaml
+++ b/values/namecheap-webhook/manifests/namecheap-webhook.yaml
@@ -24,6 +24,10 @@ spec:
       - name: HELMFILE_FILE_PATH
         value: namecheap-webhook.yaml.gotmpl
   project: sys
+  ignoreDifferences:
+    - kind: Certificate
+      jqPathExpressions:
+        - '.spec.duration'
   syncPolicy:
     managedNamespaceMetadata:
       labels: