diff --git a/python/tests/test_conserved_quantities_demartino.py b/python/tests/test_conserved_quantities_demartino.py
index ca40946db3..25473384e9 100644
--- a/python/tests/test_conserved_quantities_demartino.py
+++ b/python/tests/test_conserved_quantities_demartino.py
@@ -822,7 +822,7 @@ def test_cl_detect_execution_time(data_demartino2014):
     # <5s on modern hardware, but leave some slack
     max_time_seconds = 40 if "GITHUB_ACTIONS" in os.environ else 10
 
-    runtime = np.Inf
+    runtime = np.inf
 
     for _ in range(max_tries):
         runtime = compute_moiety_conservation_laws_demartino2014(