diff --git a/src/FasTnT.Host/Features/v1_2/Communication/Formatters/XmlResponseFormatter.cs b/src/FasTnT.Host/Features/v1_2/Communication/Formatters/XmlResponseFormatter.cs
index 9249843f..cec235cb 100644
--- a/src/FasTnT.Host/Features/v1_2/Communication/Formatters/XmlResponseFormatter.cs
+++ b/src/FasTnT.Host/Features/v1_2/Communication/Formatters/XmlResponseFormatter.cs
@@ -36,6 +36,16 @@ public static XElement FormatPoll(PollResult response)
             new XElement("resultsBody", new XElement(resultName, resultList))
         );
 
+        if (response.EventList?.Count > 0)
+        {
+            var customNamespaces = response.EventList.SelectMany(x => x.Fields.Select(x => x.Namespace)).Where(IsCustomNamespace).Distinct().ToArray();
+
+            for (var i = 0; i < customNamespaces.Length; i++)
+            {
+                queryResults.Add(new XAttribute(XNamespace.Xmlns + $"ext{i}", customNamespaces[i]));
+            }
+        }
+
         return queryResults;
     }
 
@@ -94,4 +104,9 @@ public static XElement FormatSubscribeResponse()
     {
         return new(XName.Get("SubscribeResult", Namespaces.Query));
     }
+
+    private static bool IsCustomNamespace(string value)
+    {
+        return !string.IsNullOrWhiteSpace(value) && XNamespace.Xmlns != value;
+    }
 }
diff --git a/src/FasTnT.Host/Subscriptions/Formatters/XmlSubscriptionFormatter.cs b/src/FasTnT.Host/Subscriptions/Formatters/XmlSubscriptionFormatter.cs
index 71596e66..4f25477e 100644
--- a/src/FasTnT.Host/Subscriptions/Formatters/XmlSubscriptionFormatter.cs
+++ b/src/FasTnT.Host/Subscriptions/Formatters/XmlSubscriptionFormatter.cs
@@ -22,7 +22,7 @@ public string FormatResult(string name, QueryResponse response)
             new XElement("queryName", response.QueryName),
             new XElement("subscriptionID", name),
             new XElement("resultsBody", new XElement("EventList", XmlEventFormatter.FormatList(response.EventList))));
-        var attributes = new[] { new XAttribute("creationDate", DateTime.UtcNow), new XAttribute("schemaVersion", "1") };
+        var attributes = new[] { new XAttribute("creationDate", DateTime.UtcNow), new XAttribute("schemaVersion", "1.2") };
 
         return new XElement(rootName, attributes, new XElement("EPCISBody", content)).ToString(SaveOptions.DisableFormatting);
     }