diff --git a/eastereig/charpol.py b/eastereig/charpol.py
index 6da7537..6c7af9d 100755
--- a/eastereig/charpol.py
+++ b/eastereig/charpol.py
@@ -630,9 +630,9 @@ def _jacobian_utils(self):
         self._dlda_prod = np.cumprod(DA, 0)
 
         # Create Coefficients used nu_i derivatives
-        self._der_coef = np.empty((N, N), dtype=np.object)
-        self._da_slice = np.empty((N, N), dtype=np.object)
-        self._da_shape = np.empty((N, N), dtype=np.object)
+        self._der_coef = np.empty((N, N), dtype=object)
+        self._da_slice = np.empty((N, N), dtype=object)
+        self._da_shape = np.empty((N, N), dtype=object)
         # Loop of the derivative of P, fill J raws
         for row in range(0, N):
             # loop over the nu variables, fill column