diff --git a/speedtest.py b/speedtest.py
index 7a5cc60..b5a37b5 100755
--- a/speedtest.py
+++ b/speedtest.py
@@ -969,7 +969,7 @@ class SpeedtestResults(object):
         self.client = client or {}
 
         self._share = None
-        self.timestamp = '%sZ' % datetime.datetime.utcnow().isoformat()
+        self.timestamp = '%sZ' % datetime.datetime.now(datetime.UTC).isoformat()
         self.bytes_received = 0
         self.bytes_sent = 0