diff --git a/geatpy/benchmarks/mops/DTLZ5.py b/geatpy/benchmarks/mops/DTLZ5.py
index e2f85f44..e1bf1c8f 100644
--- a/geatpy/benchmarks/mops/DTLZ5.py
+++ b/geatpy/benchmarks/mops/DTLZ5.py
@@ -51,7 +51,7 @@ def calReferObjV(self):  # 设定目标数参考值（本问题目标函数参
         P = np.vstack([np.linspace(0, 1, N), np.linspace(1, 0, N)]).T
         P = P / np.tile(np.sqrt(np.sum(P**2, 1, keepdims=True)),
                         (1, P.shape[1]))
-        P = np.hstack([P[:, np.zeros(self.M - 2, dtype=np.int)], P])
+        P = np.hstack([P[:, np.zeros(self.M - 2, dtype=np.int32)], P])
         referenceObjV = P / np.sqrt(2)**np.tile(
             np.hstack([self.M - 2, np.linspace(self.M - 2, 0, self.M - 1)]),
             (P.shape[0], 1))
diff --git a/geatpy/benchmarks/mops/DTLZ6.py b/geatpy/benchmarks/mops/DTLZ6.py
index 0933cc01..0517126d 100644
--- a/geatpy/benchmarks/mops/DTLZ6.py
+++ b/geatpy/benchmarks/mops/DTLZ6.py
@@ -51,7 +51,7 @@ def calReferObjV(self):  # 设定目标数参考值（本问题目标函数参
         P = np.vstack([np.linspace(0, 1, N), np.linspace(1, 0, N)]).T
         P = P / np.tile(np.sqrt(np.sum(P**2, 1, keepdims=True)),
                         (1, P.shape[1]))
-        P = np.hstack([P[:, np.zeros(self.M - 2, dtype=np.int)], P])
+        P = np.hstack([P[:, np.zeros(self.M - 2, dtype=np.int32)], P])
         referenceObjV = P / np.sqrt(2)**np.tile(
             np.hstack([self.M - 2, np.linspace(self.M - 2, 0, self.M - 1)]),
             (P.shape[0], 1))