diff --git a/speedtest.py b/speedtest.py
index 186b52929..2973c24b7 100755
--- a/speedtest.py
+++ b/speedtest.py
@@ -957,7 +957,7 @@ def __init__(self, download=0, upload=0, ping=0, server=None, client=None,
         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