diff --git a/tests/unit/core/samplers/test_cpu.py b/tests/unit/core/samplers/test_cpu.py
index 9f1c550a..8e8e4cd3 100644
--- a/tests/unit/core/samplers/test_cpu.py
+++ b/tests/unit/core/samplers/test_cpu.py
@@ -11,7 +11,7 @@
 
 def test_run_negative_time_elapsed(caplog):
     cpu = Cpu()
-    cpu.last_run = dt.datetime.now() + dt.timedelta(days=100)
+    cpu.last_run = dt.datetime.now(dt.timezone.utc) + dt.timedelta(days=100)
 
     result = cpu.run()