diff --git a/cmd/csaf_aggregator/full.go b/cmd/csaf_aggregator/full.go
index b7f801e..7cc4e77 100644
--- a/cmd/csaf_aggregator/full.go
+++ b/cmd/csaf_aggregator/full.go
@@ -136,7 +136,7 @@ func (p *processor) full() error {
 	canonicalURL := csaf.AggregatorURL(
 		p.cfg.Domain + "/.well-known/csaf-aggregator/aggregator.json")
 
-	lastUpdated := csaf.TimeStamp(time.Now())
+	lastUpdated := csaf.TimeStamp(time.Now().UTC())
 
 	agg := csaf.Aggregator{
 		Aggregator:    &p.cfg.Aggregator,
diff --git a/cmd/csaf_aggregator/indices.go b/cmd/csaf_aggregator/indices.go
index 1287230..100b649 100644
--- a/cmd/csaf_aggregator/indices.go
+++ b/cmd/csaf_aggregator/indices.go
@@ -195,7 +195,7 @@ func (w *worker) writeROLIE(label string, summaries []summary) error {
 				Scheme: "urn:ietf:params:rolie:category:information-type",
 				Term:   "csaf",
 			}},
-			Updated: csaf.TimeStamp(time.Now()),
+			Updated: csaf.TimeStamp(time.Now().UTC()),
 			Entry:   entries,
 		},
 	}
diff --git a/cmd/csaf_provider/actions.go b/cmd/csaf_provider/actions.go
index 46b54ac..3f1cbfd 100644
--- a/cmd/csaf_provider/actions.go
+++ b/cmd/csaf_provider/actions.go
@@ -239,7 +239,7 @@ func (c *controller) upload(r *http.Request) (interface{}, error) {
 				}
 			}
 
-			rolie.Feed.Updated = csaf.TimeStamp(time.Now())
+			rolie.Feed.Updated = csaf.TimeStamp(time.Now().UTC())
 
 			year := strconv.Itoa(ex.InitialReleaseDate.Year())