diff --git a/pymoo/algorithms/soo/nonconvex/es.py b/pymoo/algorithms/soo/nonconvex/es.py
index 6a0afee2..d3363af3 100644
--- a/pymoo/algorithms/soo/nonconvex/es.py
+++ b/pymoo/algorithms/soo/nonconvex/es.py
@@ -1,4 +1,5 @@
 import numpy as np
+import math
 
 from pymoo.algorithms.base.genetic import GeneticAlgorithm
 from pymoo.algorithms.soo.nonconvex.ga import FitnessSurvival
@@ -43,9 +44,9 @@ def __init__(self,
         """
 
         if pop_size is None and n_offsprings is not None:
-            pop_size = int(np.math.ceil(n_offsprings * rule))
+            pop_size = int(math.ceil(n_offsprings * rule))
         elif n_offsprings is None and pop_size is not None:
-            n_offsprings = int(np.math.floor(pop_size / rule))
+            n_offsprings = int(math.floor(pop_size / rule))
 
         assert pop_size is not None and n_offsprings is not None, "You have to at least provivde pop_size of n_offsprings."
         assert n_offsprings >= 2 * pop_size, "The number of offsprings should be at least double the population size."
diff --git a/pymoo/util/mnn.py b/pymoo/util/mnn.py
index 39aa6327..47d6f013 100644
--- a/pymoo/util/mnn.py
+++ b/pymoo/util/mnn.py
@@ -40,7 +40,7 @@ def calc_mnn_base(X, n_remove=0, twonn=False):
     
     D = squareform(pdist(X, metric="sqeuclidean"))
     Dnn = np.partition(D, range(1, M+1), axis=1)[:, 1:M+1]
-    d = np.product(Dnn, axis=1)
+    d = np.prod(Dnn, axis=1)
     d[extremes] = np.inf
     
     n_removed = 0
@@ -63,7 +63,7 @@ def calc_mnn_base(X, n_remove=0, twonn=False):
 
             D[:, k] = np.inf
             Dnn[H] = np.partition(D[H], range(1, M+1), axis=1)[:, 1:M+1]
-            d[H] = np.product(Dnn[H], axis=1)
+            d[H] = np.prod(Dnn[H], axis=1)
             d[extremes] = np.inf
     
     return d
diff --git a/setup.py b/setup.py
index 2cc85a0a..9e7b7fac 100644
--- a/setup.py
+++ b/setup.py
@@ -37,7 +37,7 @@
                       'scipy>=1.1',
                       'matplotlib>=3',
                       'autograd>=1.4',
-                      'cma==3.2.2',
+                      'cma>=3.2.2',
                       'alive-progress',
                       'dill',
                       'Deprecated'],