diff --git a/src/updater.rs b/src/updater.rs
index ae260dd..e4a4b36 100644
--- a/src/updater.rs
+++ b/src/updater.rs
@@ -65,8 +65,11 @@ pub async fn update_once(
         }
 
         // Update DNS records (env var mode - domain-based)
-        for (ip_type, domains) in &config.domains {
-            let ips = detected_ips.get(ip_type).cloned().unwrap_or_default();
+        for (ip_type, domains) in &config.domains {            
+            let mut ips = detected_ips.get(ip_type).cloned().unwrap_or_default();
+            // FIX: remove duplicates so CloudflareHandle::set_ips sees stable input
+            ips.sort();
+            ips.dedup();
             let record_type = ip_type.record_type();
 
             for domain_str in domains {