diff -Nrup a/src/ndimg/nd_image.c b/src/ndimg/nd_image.c
--- a/src/ndimg/nd_image.c	2019-07-20 20:14:12.000000000 +0200
+++ b/src/ndimg/nd_image.c	2023-03-13 20:54:59.211037022 +0100
@@ -39,6 +39,12 @@
 #include "ni_interpolation.h"
 #include "ni_measure.h"
 
+/* uses the old numpy API since it sets the data attribute */
+#ifdef NPY_NO_DEPRECATED_API
+#undef NPY_NO_DEPRECATED_API
+#endif
+#define NPY_NO_DEPRECATED_API 0
+
 typedef struct {
     PyObject *function;
     PyObject *extra_arguments;
diff -Nrup a/src/ndimg/nd_image.h b/src/ndimg/nd_image.h
--- a/src/ndimg/nd_image.h	2019-07-20 20:14:12.000000000 +0200
+++ b/src/ndimg/nd_image.h	2023-03-13 21:03:58.888045307 +0100
@@ -42,6 +42,12 @@
 #include <numpy/noprefix.h>
 #undef NO_IMPORT_ARRAY
 
+/* uses the old numpy API since it sets the data attribute */
+#ifdef NPY_NO_DEPRECATED_API
+#undef NPY_NO_DEPRECATED_API
+#endif
+#define NPY_NO_DEPRECATED_API 0
+
 /* Eventually get rid of everything below this line */
 
 typedef enum
@@ -137,7 +143,7 @@ NA_OutputArray(PyObject *a, NumarrayType
         }
         ret = (PyArrayObject *)PyArray_Empty(PyArray_NDIM(a), PyArray_DIMS(a),
                                                                                  dtype, 0);
-        ret->flags |= NPY_UPDATEIFCOPY;
+        ret->flags |= NPY_ITER_UPDATEIFCOPY;
         ret->base = a;
         PyArray_FLAGS(a) &= ~NPY_WRITEABLE;
         Py_INCREF(a);
@@ -155,7 +161,7 @@ copy from the temporary back to the orig
 static PyArrayObject *
 NA_IoArray(PyObject *a, NumarrayType t, int requires)
 {
-        PyArrayObject *shadow = NA_InputArray(a, t, requires | NPY_UPDATEIFCOPY );
+        PyArrayObject *shadow = NA_InputArray(a, t, requires | NPY_ITER_UPDATEIFCOPY );
 
         if (!shadow) return NULL;
 
@@ -165,7 +171,7 @@ NA_IoArray(PyObject *a, NumarrayType t,
         if (!PyArray_ISWRITEABLE(shadow)) {
                 PyErr_Format(PyExc_TypeError,
                                          "NA_IoArray: I/O array must be writable array");
-                PyArray_XDECREF_ERR(shadow);
+                PyArray_XDECREF(shadow);
                 return NULL;
         }