diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 55c3f2d..3bbdf2b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,16 +10,27 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        numpy-version: ['2.3.2', 'nightly']
 
     steps:
       - uses: actions/checkout@v3
       - name: Setup Python
         uses: actions/setup-python@v3
         with:
-          python-version: "3.10"
+          python-version: "3.11"
       - name: Install build and test dependencies
         run: |
-          python -m pip install -U pip build pytest unyt wheel meson ninja meson-python patchelf pandas numpy
+          python -m pip install -U pip build pytest unyt wheel meson ninja meson-python patchelf pandas
+      - name: Install numpy nightly
+        if: matrix.numpy-version == 'nightly'
+        run: |
+          pip install --pre --upgrade --timeout=60 -i https://pypi.anaconda.org/scientific-python-nightly-wheels/simple numpy
+      - name: Install numpy from PyPI
+        if: matrix.numpy-version != 'nightly'
+        run: |
+          pip install "numpy==${{ matrix.numpy-version }}"
       - name: Install asciidtype
         working-directory: asciidtype
         run: |
@@ -63,8 +74,13 @@ jobs:
       - name: Install quaddtype
         working-directory: quaddtype
         run: |
+          if [ "${{ matrix.numpy-version }}" == "nightly" ]; then
+            # obscure errors when using command line 2_4 if numpy does not define it
+            python -c "import numpy as np; assert np.__version__ >= '2.4'"
+            extra_args="-Csetup-args=-Dcpp_args=-DNPY_TARGET_VERSION=NPY_2_4_API_VERSION --no-build-isolation"
+          fi
           export LDFLAGS="-fopenmp"
-          python -m pip install . -v
+          python -m pip install $extra_args . -v
 
       - name: Run quaddtype tests
         working-directory: quaddtype
diff --git a/quaddtype/numpy_quaddtype/src/casts.cpp b/quaddtype/numpy_quaddtype/src/casts.cpp
index bfd4296..8f9385d 100644
--- a/quaddtype/numpy_quaddtype/src/casts.cpp
+++ b/quaddtype/numpy_quaddtype/src/casts.cpp
@@ -1,7 +1,9 @@
 #define PY_ARRAY_UNIQUE_SYMBOL QuadPrecType_ARRAY_API
 #define PY_UFUNC_UNIQUE_SYMBOL QuadPrecType_UFUNC_API
 #define NPY_NO_DEPRECATED_API NPY_2_0_API_VERSION
-#define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#ifndef NPY_TARGET_VERSION
+  #define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#endif
 #define NO_IMPORT_ARRAY
 #define NO_IMPORT_UFUNC
 
@@ -21,6 +23,11 @@ extern "C" {
 #include "casts.h"
 #include "dtype.h"
 
+#if NPY_FEATURE_VERSION < NPY_2_0_API_VERSION
+  #warning "Is NPY_TARGET_VERSION set too high for this numpy installation?"
+  #error "NPY_FEATURE_VERSION too low, must be > NPY_2_0_API_VERSION"
+#endif
+
 #define NUM_CASTS 34  // 16 to_casts + 16 from_casts + 1 quad_to_quad + 1 void_to_quad
 
 static NPY_CASTING
@@ -157,7 +164,7 @@ void_to_quad_resolve_descriptors(PyObject *NPY_UNUSED(self), PyArray_DTypeMeta *
                                 PyArray_Descr *given_descrs[2], PyArray_Descr *loop_descrs[2],
                                 npy_intp *view_offset)
 {
-    PyErr_SetString(PyExc_TypeError, 
+    PyErr_SetString(PyExc_TypeError,
         "Void to QuadPrecision cast is not implemented");
     return (NPY_CASTING)-1;
 }
@@ -401,7 +408,7 @@ to_quad<long double>(long double x, QuadBackendType backend)
 }
 
 template <typename T>
-static NPY_CASTING
+static int
 numpy_to_quad_resolve_descriptors(PyObject *NPY_UNUSED(self), PyArray_DTypeMeta *dtypes[2],
                                   PyArray_Descr *given_descrs[2], PyArray_Descr *loop_descrs[2],
                                   npy_intp *view_offset)
@@ -419,7 +426,11 @@ numpy_to_quad_resolve_descriptors(PyObject *NPY_UNUSED(self), PyArray_DTypeMeta
     }
 
     loop_descrs[0] = PyArray_GetDefaultDescr(dtypes[0]);
+#if defined(NPY_2_3_API_VERSION) && (NPY_TARGET_VERSION > NPY_2_3_API_VERSION)
+    return NPY_SAFE_CASTING | NPY_SAME_VALUE_CASTING_FLAG;
+#else
     return NPY_SAFE_CASTING;
+#endif
 }
 
 template <typename T>
@@ -667,6 +678,27 @@ from_quad<long double>(quad_value x, QuadBackendType backend)
 }
 
 template <typename T>
+static inline int
+from_quad_checked(quad_value x, QuadBackendType backend, typename NpyType<T>::TYPE *ret) {
+    *ret = from_quad<typename NpyType<T>::TYPE>(x, backend);
+    quad_value check = to_quad<typename NpyType<T>::TYPE>(*ret, backend);
+    if (backend == BACKEND_SLEEF) {
+        if (check.sleef_value == x.sleef_value) {
+            return 0;
+        }
+    }
+    else {
+        if (check.longdouble_value == x.longdouble_value) {
+            return 0;
+        }
+    }
+    NPY_ALLOW_C_API_DEF;
+    NPY_ALLOW_C_API;
+    PyErr_SetString(PyExc_ValueError, "could not cast 'same_value' to QuadType");
+    NPY_DISABLE_C_API;
+    return -1;
+}
+
 static NPY_CASTING
 quad_to_numpy_resolve_descriptors(PyObject *NPY_UNUSED(self), PyArray_DTypeMeta *dtypes[2],
                                   PyArray_Descr *given_descrs[2], PyArray_Descr *loop_descrs[2],
@@ -694,6 +726,28 @@ quad_to_numpy_strided_loop_unaligned(PyArrayMethod_Context *context, char *const
 
     size_t elem_size = (backend == BACKEND_SLEEF) ? sizeof(Sleef_quad) : sizeof(long double);
 
+#if defined(NPY_2_3_API_VERSION) && (NPY_TARGET_VERSION > NPY_2_3_API_VERSION)
+    int same_value_casting = 0;
+    if (PyArray_GetNDArrayCFeatureVersion() > NPY_2_3_API_VERSION) {
+        same_value_casting = ((context->flags & NPY_SAME_VALUE_CONTEXT_FLAG) == NPY_SAME_VALUE_CONTEXT_FLAG);
+    }
+    if (same_value_casting) {
+        while (N--) {
+            quad_value in_val;
+            memcpy(&in_val, in_ptr, elem_size);
+            typename NpyType<T>::TYPE out_val;
+            if (from_quad_checked<T>(in_val, backend, &out_val) < 0) {
+                return -1;
+            }
+            memcpy(out_ptr, &out_val, sizeof(typename NpyType<T>::TYPE));
+
+            in_ptr += strides[0];
+            out_ptr += strides[1];
+        }
+    } else {
+#else
+    {
+#endif
     while (N--) {
         quad_value in_val;
         memcpy(&in_val, in_ptr, elem_size);
@@ -703,7 +757,7 @@ quad_to_numpy_strided_loop_unaligned(PyArrayMethod_Context *context, char *const
 
         in_ptr += strides[0];
         out_ptr += strides[1];
-    }
+    }}
     return 0;
 }
 
@@ -720,6 +774,33 @@ quad_to_numpy_strided_loop_aligned(PyArrayMethod_Context *context, char *const d
     QuadPrecDTypeObject *quad_descr = (QuadPrecDTypeObject *)context->descriptors[0];
     QuadBackendType backend = quad_descr->backend;
 
+#if defined(NPY_2_3_API_VERSION) && (NPY_TARGET_VERSION > NPY_2_3_API_VERSION)
+    int same_value_casting = 0;
+    if (PyArray_GetNDArrayCFeatureVersion() > NPY_2_3_API_VERSION) {
+        same_value_casting = ((context->flags & NPY_SAME_VALUE_CONTEXT_FLAG) == NPY_SAME_VALUE_CONTEXT_FLAG);
+    }
+    if (same_value_casting) {
+        while (N--) {
+            quad_value in_val;
+            if (backend == BACKEND_SLEEF) {
+                in_val.sleef_value = *(Sleef_quad *)in_ptr;
+            }
+            else {
+                in_val.longdouble_value = *(long double *)in_ptr;
+            }
+
+            typename NpyType<T>::TYPE out_val;
+            if (from_quad_checked<T>(in_val, backend, &out_val) < 0) {
+                return -1;
+            }
+            *(typename NpyType<T>::TYPE *)(out_ptr) = out_val;
+
+            in_ptr += strides[0];
+            out_ptr += strides[1];
+    }} else {
+#else
+    {
+#endif
     while (N--) {
         quad_value in_val;
         if (backend == BACKEND_SLEEF) {
@@ -734,7 +815,7 @@ quad_to_numpy_strided_loop_aligned(PyArrayMethod_Context *context, char *const d
 
         in_ptr += strides[0];
         out_ptr += strides[1];
-    }
+    }}
     return 0;
 }
 
@@ -762,7 +843,7 @@ add_cast_from(PyArray_DTypeMeta *to)
     PyArray_DTypeMeta **dtypes = new PyArray_DTypeMeta *[2]{&QuadPrecDType, to};
 
     PyType_Slot *slots = new PyType_Slot[]{
-            {NPY_METH_resolve_descriptors, (void *)&quad_to_numpy_resolve_descriptors<T>},
+            {NPY_METH_resolve_descriptors, (void *)&quad_to_numpy_resolve_descriptors},
             {NPY_METH_strided_loop, (void *)&quad_to_numpy_strided_loop_aligned<T>},
             {NPY_METH_unaligned_strided_loop, (void *)&quad_to_numpy_strided_loop_unaligned<T>},
             {0, nullptr}};
@@ -771,7 +852,11 @@ add_cast_from(PyArray_DTypeMeta *to)
             .name = "cast_QuadPrec_to_NumPy",
             .nin = 1,
             .nout = 1,
+#if defined(NPY_2_3_API_VERSION) && (NPY_TARGET_VERSION > NPY_2_3_API_VERSION)
+            .casting = NPY_SAME_VALUE_CASTING,
+#else
             .casting = NPY_UNSAFE_CASTING,
+#endif
             .flags = NPY_METH_SUPPORTS_UNALIGNED,
             .dtypes = dtypes,
             .slots = slots,
@@ -904,4 +989,4 @@ free_casts(void)
         }
     }
     spec_count = 0;
-}
\ No newline at end of file
+}
diff --git a/quaddtype/numpy_quaddtype/src/dragon4.c b/quaddtype/numpy_quaddtype/src/dragon4.c
index 5843141..b35e408 100644
--- a/quaddtype/numpy_quaddtype/src/dragon4.c
+++ b/quaddtype/numpy_quaddtype/src/dragon4.c
@@ -3,6 +3,16 @@ This code was extracted from NumPy and the original author was Allan Haldane(@ah
 Modifications are specific to support the SLEEF_QUAD
 */
 
+#define PY_ARRAY_UNIQUE_SYMBOL QuadPrecType_ARRAY_API
+#define PY_UFUNC_UNIQUE_SYMBOL QuadPrecType_UFUNC_API
+#define NPY_NO_DEPRECATED_API NPY_2_0_API_VERSION
+#ifndef NPY_TARGET_VERSION
+  #define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#endif
+#define NO_IMPORT_ARRAY
+#define NO_IMPORT_UFUNC
+
+
 #include <numpy/npy_common.h>
 #include <math.h>
 #include <stdio.h>
@@ -14,17 +24,16 @@ Modifications are specific to support the SLEEF_QUAD
 #include "quaddtype_config.h"
 
 
-#define PY_ARRAY_UNIQUE_SYMBOL QuadPrecType_ARRAY_API
-#define PY_UFUNC_UNIQUE_SYMBOL QuadPrecType_UFUNC_API
-#define NPY_NO_DEPRECATED_API NPY_2_0_API_VERSION
-#define NPY_TARGET_VERSION NPY_2_0_API_VERSION
-#define NO_IMPORT_ARRAY
-#define NO_IMPORT_UFUNC
-
 #include "dragon4.h"
 #include "dtype.h"
 #include "scalar.h"
 
+#if NPY_FEATURE_VERSION < NPY_2_0_API_VERSION
+  #warning "Is NPY_TARGET_VERSION set too high for this numpy installation?"
+  #warning "NPY_FEATURE_VERSION is NPY_TOSTRING(NPY_FEATURE_VERSION)"
+  #error "NPY_FEATURE_VERSION too low, must be > NPY_2_0_API_VERSION"
+#endif
+
 
 #ifdef __cplusplus
     #define NPY_TLS thread_local
@@ -2044,4 +2053,4 @@ Dragon4_Scientific(PyObject *obj, DigitMode digit_mode, int precision, int min_d
     }
 
     return NULL;
-}
\ No newline at end of file
+}
diff --git a/quaddtype/numpy_quaddtype/src/dtype.c b/quaddtype/numpy_quaddtype/src/dtype.c
index 7d0fad3..f277021 100644
--- a/quaddtype/numpy_quaddtype/src/dtype.c
+++ b/quaddtype/numpy_quaddtype/src/dtype.c
@@ -5,7 +5,9 @@
 #define PY_ARRAY_UNIQUE_SYMBOL QuadPrecType_ARRAY_API
 #define PY_UFUNC_UNIQUE_SYMBOL QuadPrecType_UFUNC_API
 #define NPY_NO_DEPRECATED_API NPY_2_0_API_VERSION
-#define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#ifndef NPY_TARGET_VERSION
+  #define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#endif
 #define NO_IMPORT_ARRAY
 #define NO_IMPORT_UFUNC
 #include "numpy/arrayobject.h"
@@ -17,6 +19,11 @@
 #include "dtype.h"
 #include "dragon4.h"
 
+#if NPY_FEATURE_VERSION < NPY_2_0_API_VERSION
+  #warning "Is NPY_TARGET_VERSION set too high for this numpy installation?"
+  #error "NPY_FEATURE_VERSION too low, must be > NPY_2_0_API_VERSION"
+#endif
+
 static inline int
 quad_load(void *x, char *data_ptr, QuadBackendType backend)
 {
@@ -263,4 +270,4 @@ init_quadprec_dtype(void)
     free_casts();
 
     return 0;
-}
\ No newline at end of file
+}
diff --git a/quaddtype/numpy_quaddtype/src/quadblas_interface.cpp b/quaddtype/numpy_quaddtype/src/quadblas_interface.cpp
index b51851a..f9b15b4 100644
--- a/quaddtype/numpy_quaddtype/src/quadblas_interface.cpp
+++ b/quaddtype/numpy_quaddtype/src/quadblas_interface.cpp
@@ -3,7 +3,7 @@
 #include <algorithm>
 
 #ifndef DISABLE_QUADBLAS
-#include "../subprojects/qblas/include/quadblas/quadblas.hpp"
+#include "quadblas/quadblas.hpp"
 #endif // DISABLE_QUADBLAS
 
 extern "C" {
@@ -230,4 +230,4 @@ _quadblas_get_num_threads(void)
 
 #endif // DISABLE_QUADBLAS
 
-}  // extern "C"
\ No newline at end of file
+}  // extern "C"
diff --git a/quaddtype/numpy_quaddtype/src/quaddtype_main.c b/quaddtype/numpy_quaddtype/src/quaddtype_main.c
index b8c2bc4..40eeba7 100644
--- a/quaddtype/numpy_quaddtype/src/quaddtype_main.c
+++ b/quaddtype/numpy_quaddtype/src/quaddtype_main.c
@@ -6,8 +6,9 @@
 #define PY_ARRAY_UNIQUE_SYMBOL QuadPrecType_ARRAY_API
 #define PY_UFUNC_UNIQUE_SYMBOL QuadPrecType_UFUNC_API
 #define NPY_NO_DEPRECATED_API NPY_2_0_API_VERSION
-#define NPY_TARGET_VERSION NPY_2_0_API_VERSION
-
+#ifndef NPY_TARGET_VERSION
+  #define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#endif
 #include "numpy/arrayobject.h"
 #include "numpy/dtype_api.h"
 #include "numpy/ufuncobject.h"
@@ -19,6 +20,11 @@
 #include "quadblas_interface.h"
 #include "float.h"
 
+#if NPY_FEATURE_VERSION < NPY_2_0_API_VERSION
+  #warning "Is NPY_TARGET_VERSION set too high for this numpy installation?"
+  #error "NPY_FEATURE_VERSION too low, must be > NPY_2_0_API_VERSION"
+#endif
+
 static PyObject *
 py_is_longdouble_128(PyObject *self, PyObject *args)
 {
@@ -177,4 +183,4 @@ PyInit__quaddtype_main(void)
 error:
     Py_XDECREF(m);
     return NULL;
-}
\ No newline at end of file
+}
diff --git a/quaddtype/numpy_quaddtype/src/scalar_ops.cpp b/quaddtype/numpy_quaddtype/src/scalar_ops.cpp
index ef0fa84..d24aa01 100644
--- a/quaddtype/numpy_quaddtype/src/scalar_ops.cpp
+++ b/quaddtype/numpy_quaddtype/src/scalar_ops.cpp
@@ -1,6 +1,8 @@
 #define PY_ARRAY_UNIQUE_SYMBOL QuadPrecType_ARRAY_API
 #define NPY_NO_DEPRECATED_API NPY_2_0_API_VERSION
-#define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#ifndef NPY_TARGET_VERSION
+  #define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#endif
 #define NO_IMPORT_ARRAY
 
 extern "C" {
@@ -18,6 +20,11 @@ extern "C" {
 #include "scalar_ops.h"
 #include "quad_common.h"
 
+#if NPY_FEATURE_VERSION < NPY_2_0_API_VERSION
+  #warning "Is NPY_TARGET_VERSION set too high for this numpy installation?"
+  #error "NPY_FEATURE_VERSION too low, must be > NPY_2_0_API_VERSION"
+#endif
+
 template <unary_op_quad_def sleef_op, unary_op_longdouble_def longdouble_op>
 static PyObject *
 quad_unary_func(QuadPrecisionObject *self)
@@ -240,4 +247,4 @@ PyNumberMethods quad_as_scalar = {
         .nb_int = (unaryfunc)QuadPrecision_int,
         .nb_float = (unaryfunc)QuadPrecision_float,
         .nb_true_divide = (binaryfunc)quad_binary_func<quad_div, ld_div>,
-};
\ No newline at end of file
+};
diff --git a/quaddtype/numpy_quaddtype/src/umath/binary_ops.cpp b/quaddtype/numpy_quaddtype/src/umath/binary_ops.cpp
index 8adfe4d..3055b47 100644
--- a/quaddtype/numpy_quaddtype/src/umath/binary_ops.cpp
+++ b/quaddtype/numpy_quaddtype/src/umath/binary_ops.cpp
@@ -1,7 +1,9 @@
 #define PY_ARRAY_UNIQUE_SYMBOL QuadPrecType_ARRAY_API
 #define PY_UFUNC_UNIQUE_SYMBOL QuadPrecType_UFUNC_API
 #define NPY_NO_DEPRECATED_API NPY_2_0_API_VERSION
-#define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#ifndef NPY_TARGET_VERSION
+  #define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#endif
 #define NO_IMPORT_ARRAY
 #define NO_IMPORT_UFUNC
 
@@ -21,6 +23,11 @@
 #include "promoters.hpp"
 #include "binary_ops.h"
 
+#if NPY_FEATURE_VERSION < NPY_2_0_API_VERSION
+  #warning "Is NPY_TARGET_VERSION set too high for this numpy installation?"
+  #error "NPY_FEATURE_VERSION too low, must be > NPY_2_0_API_VERSION"
+#endif
+
 static NPY_CASTING
 quad_binary_op_resolve_descriptors(PyObject *self, PyArray_DTypeMeta *const dtypes[],
                                    PyArray_Descr *const given_descrs[],
@@ -241,4 +248,4 @@ init_quad_binary_ops(PyObject *numpy)
         return -1;
     }
     return 0;
-}
\ No newline at end of file
+}
diff --git a/quaddtype/numpy_quaddtype/src/umath/comparison_ops.cpp b/quaddtype/numpy_quaddtype/src/umath/comparison_ops.cpp
index e4b9579..4cfa5bb 100644
--- a/quaddtype/numpy_quaddtype/src/umath/comparison_ops.cpp
+++ b/quaddtype/numpy_quaddtype/src/umath/comparison_ops.cpp
@@ -1,7 +1,9 @@
 #define PY_ARRAY_UNIQUE_SYMBOL QuadPrecType_ARRAY_API
 #define PY_UFUNC_UNIQUE_SYMBOL QuadPrecType_UFUNC_API
 #define NPY_NO_DEPRECATED_API NPY_2_0_API_VERSION
-#define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#ifndef NPY_TARGET_VERSION
+  #define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#endif
 #define NO_IMPORT_ARRAY
 #define NO_IMPORT_UFUNC
 
@@ -23,6 +25,10 @@
 #include "binary_ops.h"
 #include "comparison_ops.h"
 
+#if NPY_FEATURE_VERSION < NPY_2_0_API_VERSION
+  #warning "Is NPY_TARGET_VERSION set too high for this numpy installation?"
+  #error "NPY_FEATURE_VERSION too low, must be > NPY_2_0_API_VERSION"
+#endif
 
 static NPY_CASTING
 quad_comparison_op_resolve_descriptors(PyObject *self, PyArray_DTypeMeta *const dtypes[],
@@ -241,4 +247,4 @@ init_quad_comps(PyObject *numpy)
     }
 
     return 0;
-}
\ No newline at end of file
+}
diff --git a/quaddtype/numpy_quaddtype/src/umath/matmul.cpp b/quaddtype/numpy_quaddtype/src/umath/matmul.cpp
index 6ac0d5c..f10adab 100644
--- a/quaddtype/numpy_quaddtype/src/umath/matmul.cpp
+++ b/quaddtype/numpy_quaddtype/src/umath/matmul.cpp
@@ -1,7 +1,9 @@
 #define PY_ARRAY_UNIQUE_SYMBOL QuadPrecType_ARRAY_API
 #define PY_UFUNC_UNIQUE_SYMBOL QuadPrecType_UFUNC_API
 #define NPY_NO_DEPRECATED_API NPY_2_0_API_VERSION
-#define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#ifndef NPY_TARGET_VERSION
+  #define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#endif
 #define NO_IMPORT_ARRAY
 #define NO_IMPORT_UFUNC
 
@@ -24,6 +26,11 @@ extern "C" {
 #include "promoters.hpp"
 #include "../quadblas_interface.h"
 
+#if NPY_FEATURE_VERSION < NPY_2_0_API_VERSION
+  #warning "Is NPY_TARGET_VERSION set too high for this numpy installation?"
+  #error "NPY_FEATURE_VERSION too low, must be > NPY_2_0_API_VERSION"
+#endif
+
 static NPY_CASTING
 quad_matmul_resolve_descriptors(PyObject *self, PyArray_DTypeMeta *const dtypes[],
                                 PyArray_Descr *const given_descrs[], PyArray_Descr *loop_descrs[],
@@ -452,4 +459,4 @@ init_matmul_ops(PyObject *numpy)
     Py_DECREF(ufunc);
 
     return 0;
-}
\ No newline at end of file
+}
diff --git a/quaddtype/numpy_quaddtype/src/umath/umath.cpp b/quaddtype/numpy_quaddtype/src/umath/umath.cpp
index 0c72d32..462d4fe 100644
--- a/quaddtype/numpy_quaddtype/src/umath/umath.cpp
+++ b/quaddtype/numpy_quaddtype/src/umath/umath.cpp
@@ -1,7 +1,9 @@
 #define PY_ARRAY_UNIQUE_SYMBOL QuadPrecType_ARRAY_API
 #define PY_UFUNC_UNIQUE_SYMBOL QuadPrecType_UFUNC_API
 #define NPY_NO_DEPRECATED_API NPY_2_0_API_VERSION
-#define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#ifndef NPY_TARGET_VERSION
+  #define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#endif
 #define NO_IMPORT_ARRAY
 #define NO_IMPORT_UFUNC
 
@@ -25,6 +27,11 @@ extern "C" {
 #include "comparison_ops.h"
 #include "matmul.h"
 
+#if NPY_FEATURE_VERSION < NPY_2_0_API_VERSION
+  #warning "Is NPY_TARGET_VERSION set too high for this numpy installation?"
+  #error "NPY_FEATURE_VERSION too low, must be > NPY_2_0_API_VERSION"
+#endif
+
 // helper debugging function
 static const char *
 get_dtype_name(PyArray_DTypeMeta *dtype)
@@ -119,4 +126,4 @@ init_quad_umath(void)
 err:
     Py_DECREF(numpy);
     return -1;
-}
\ No newline at end of file
+}
diff --git a/quaddtype/numpy_quaddtype/src/umath/unary_ops.cpp b/quaddtype/numpy_quaddtype/src/umath/unary_ops.cpp
index d60591e..e866d23 100644
--- a/quaddtype/numpy_quaddtype/src/umath/unary_ops.cpp
+++ b/quaddtype/numpy_quaddtype/src/umath/unary_ops.cpp
@@ -1,7 +1,9 @@
 #define PY_ARRAY_UNIQUE_SYMBOL QuadPrecType_ARRAY_API
 #define PY_UFUNC_UNIQUE_SYMBOL QuadPrecType_UFUNC_API
 #define NPY_NO_DEPRECATED_API NPY_2_0_API_VERSION
-#define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#ifndef NPY_TARGET_VERSION
+  #define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#endif
 #define NO_IMPORT_ARRAY
 #define NO_IMPORT_UFUNC
 
@@ -20,6 +22,11 @@ extern "C" {
 #include "../dtype.h"
 #include "../ops.hpp"
 
+#if NPY_FEATURE_VERSION < NPY_2_0_API_VERSION
+  #warning "Is NPY_TARGET_VERSION set too high for this numpy installation?"
+  #error "NPY_FEATURE_VERSION too low, must be > NPY_2_0_API_VERSION"
+#endif
+
 static NPY_CASTING
 quad_unary_op_resolve_descriptors(PyObject *self, PyArray_DTypeMeta *const dtypes[],
                                   PyArray_Descr *const given_descrs[], PyArray_Descr *loop_descrs[],
@@ -235,4 +242,4 @@ init_quad_unary_ops(PyObject *numpy)
         return -1;
     }
     return 0;
-}
\ No newline at end of file
+}
diff --git a/quaddtype/numpy_quaddtype/src/umath/unary_props.cpp b/quaddtype/numpy_quaddtype/src/umath/unary_props.cpp
index 7e399ad..f3df47b 100644
--- a/quaddtype/numpy_quaddtype/src/umath/unary_props.cpp
+++ b/quaddtype/numpy_quaddtype/src/umath/unary_props.cpp
@@ -1,7 +1,9 @@
 #define PY_ARRAY_UNIQUE_SYMBOL QuadPrecType_ARRAY_API
 #define PY_UFUNC_UNIQUE_SYMBOL QuadPrecType_UFUNC_API
 #define NPY_NO_DEPRECATED_API NPY_2_0_API_VERSION
-#define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#ifndef NPY_TARGET_VERSION
+  #define NPY_TARGET_VERSION NPY_2_0_API_VERSION
+#endif
 #define NO_IMPORT_ARRAY
 #define NO_IMPORT_UFUNC
 
@@ -20,6 +22,11 @@ extern "C" {
 #include "../dtype.h"
 #include "../ops.hpp"
 
+#if NPY_FEATURE_VERSION < NPY_2_0_API_VERSION
+  #warning "Is NPY_TARGET_VERSION set too high for this numpy installation?"
+  #error "NPY_FEATURE_VERSION too low, must be > NPY_2_0_API_VERSION"
+#endif
+
 static NPY_CASTING
 quad_unary_prop_resolve_descriptors(PyObject *self, PyArray_DTypeMeta *const dtypes[],
                                     PyArray_Descr *const given_descrs[], PyArray_Descr *loop_descrs[],
diff --git a/quaddtype/tests/test_quaddtype.py b/quaddtype/tests/test_quaddtype.py
index a761df1..c9c8df0 100644
--- a/quaddtype/tests/test_quaddtype.py
+++ b/quaddtype/tests/test_quaddtype.py
@@ -6,6 +6,7 @@
 import numpy_quaddtype
 from numpy_quaddtype import QuadPrecDType, QuadPrecision
 
+np_major, np_minor = map(int, np.__version__.split('.')[:2])
 
 def test_create_scalar_simple():
     assert isinstance(QuadPrecision("12.0"), QuadPrecision)
@@ -76,6 +77,17 @@ def test_unsupported_astype(dtype):
           np.array(QuadPrecision(1)).astype(dtype, casting="unsafe")
 
 
+@pytest.mark.skipif(np_major < 2 or (np_major == 2 and np_minor < 4),
+        reason="numpy version>2.4 required for test")
+def test_same_value_cast():
+    a = np.arange(30, dtype=np.float32)
+    # upcasting can never fail
+    b = a.astype(QuadPrecision, casting='same_value')
+    c = b.astype(np.float32, casting='same_value')
+    assert np.all(c == a)
+    with pytest.raises(ValueError, match="could not cast 'same_value'"):
+        (b + 1e22).astype(np.float32, casting='same_value')
+
 def test_basic_equality():
     assert QuadPrecision("12") == QuadPrecision(
         "12.0") == QuadPrecision("12.00")