diff --git a/aeon/dj_pipeline/subject.py b/aeon/dj_pipeline/subject.py
index d3698b1a..52a524a4 100644
--- a/aeon/dj_pipeline/subject.py
+++ b/aeon/dj_pipeline/subject.py
@@ -375,7 +375,7 @@ def make(self, key):
 
             associate_subject_and_experiment(eartag_or_id)
 
-            completion_time = datetime.now(timezone.utc)
+            completion_time = datetime.now(UTC)
             self.insert1(
                 {
                     **key,