diff --git a/services/search/pkg/opensearch/internal/test/testdata/resource_file.json b/services/search/pkg/opensearch/internal/test/testdata/resource_file.json
index 3d63d3e385..cc2a1fda15 100644
--- a/services/search/pkg/opensearch/internal/test/testdata/resource_file.json
+++ b/services/search/pkg/opensearch/internal/test/testdata/resource_file.json
@@ -8,7 +8,7 @@
   "Name" : "dummy name",
   "Content" : "dummy content",
   "Size" : 42,
-  "Mtime" : "2025-07-24 15:15:01.324093 +0200 CEST m=+0.000056251",
+  "Mtime" : "2025-07-24T15:15:01.324093+02:00",
   "MimeType" : "image/jpeg",
   "Tags" : [ "dummy" ],
   "Deleted" : false,