diff --git a/tests/test_cmaes.py b/tests/test_cmaes.py
index 95883f86..b6125373 100644
--- a/tests/test_cmaes.py
+++ b/tests/test_cmaes.py
@@ -1,7 +1,6 @@
 import random
 import tempfile
 from typing import Dict
-from operator import attrgetter
 
 import numpy as np
 
diff --git a/tests/test_propulator_sphere.py b/tests/test_propulator_sphere.py
index ba51f073..d843d5f0 100644
--- a/tests/test_propulator_sphere.py
+++ b/tests/test_propulator_sphere.py
@@ -1,7 +1,6 @@
 import random
 import tempfile
 from typing import Dict
-from operator import attrgetter
 import logging
 
 import numpy as np
diff --git a/tests/test_pso.py b/tests/test_pso.py
index 7720957f..e89289f9 100644
--- a/tests/test_pso.py
+++ b/tests/test_pso.py
@@ -1,7 +1,6 @@
 import random
 import tempfile
 from typing import Dict
-from operator import attrgetter
 
 from mpi4py import MPI
 import numpy as np