diff --git a/.github/workflows/array-api-tests-numpy-dev.yml b/.github/workflows/array-api-tests-numpy-dev.yml
new file mode 100644
index 00000000..eef4269d
--- /dev/null
+++ b/.github/workflows/array-api-tests-numpy-dev.yml
@@ -0,0 +1,11 @@
+name: Array API Tests (NumPy dev)
+
+on: [push, pull_request]
+
+jobs:
+  array-api-tests-numpy-dev:
+    uses: ./.github/workflows/array-api-tests.yml
+    with:
+      package-name: numpy
+      extra-requires: '--pre --extra-index https://pypi.anaconda.org/scientific-python-nightly-wheels/simple'
+      xfails-file-extra: '-dev'
diff --git a/.github/workflows/array-api-tests.yml b/.github/workflows/array-api-tests.yml
index 6e15bcad..c7e2af5c 100644
--- a/.github/workflows/array-api-tests.yml
+++ b/.github/workflows/array-api-tests.yml
@@ -6,6 +6,12 @@ on:
       package-name:
         required: true
         type: string
+      module-name:
+        required: false
+        type: string
+      extra-requires:
+        required: false
+        type: string
       package-version:
         required: false
         type: string
@@ -49,17 +55,18 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
-      # NumPy 1.21 doesn't support Python 3.11. There doesn't seem to be a way
-      # to put this in the numpy 1.21 config file.
-      if: "! (matrix.python-version == '3.11' && inputs.package-name == 'numpy' && contains(inputs.package-version, '1.21'))"
+      # NumPy 1.21 doesn't support Python 3.11. NumPy 2.0 doesn't support
+      # Python 3.8. There doesn't seem to be a way to put this in the numpy
+      # 1.21 config file.
+      if: "! ((matrix.python-version == '3.11' && inputs.package-name == 'numpy' && contains(inputs.package-version, '1.21')) || (matrix.python-version == '3.8' && inputs.package-name == 'numpy' && contains(inputs.xfails-file-extra, 'dev')))"
       run: |
         python -m pip install --upgrade pip
-        python -m pip install '${{ inputs.package-name }} ${{ inputs.package-version }}'
+        python -m pip install '${{ inputs.package-name }} ${{ inputs.package-version }}' ${{ inputs.extra-requires }}
         python -m pip install -r ${GITHUB_WORKSPACE}/array-api-tests/requirements.txt
     - name: Run the array API testsuite (${{ inputs.package-name }})
-      if: "! (matrix.python-version == '3.11' && inputs.package-name == 'numpy' && contains(inputs.package-version, '1.21'))"
+      if: "! ((matrix.python-version == '3.11' && inputs.package-name == 'numpy' && contains(inputs.package-version, '1.21')) || (matrix.python-version == '3.8' && inputs.package-name == 'numpy' && contains(inputs.xfails-file-extra, 'dev')))"
       env:
-        ARRAY_API_TESTS_MODULE: array_api_compat.${{ inputs.package-name }}
+        ARRAY_API_TESTS_MODULE: array_api_compat.${{ inputs.module-name || inputs.package-name }}
         # This enables the NEP 50 type promotion behavior (without it a lot of
         # tests fail on bad scalar type promotion behavior)
         NPY_PROMOTION_STATE: weak
diff --git a/array_api_compat/common/_helpers.py b/array_api_compat/common/_helpers.py
index 5cb029dc..c1b0aef3 100644
--- a/array_api_compat/common/_helpers.py
+++ b/array_api_compat/common/_helpers.py
@@ -71,9 +71,7 @@ def your_function(x, y):
     """
     namespaces = set()
     for x in xs:
-        if hasattr(x, '__array_namespace__'):
-            namespaces.add(x.__array_namespace__(api_version=api_version))
-        elif _is_numpy_array(x):
+        if _is_numpy_array(x):
             _check_api_version(api_version)
             if _use_compat:
                 from .. import numpy as numpy_namespace
@@ -97,6 +95,8 @@ def your_function(x, y):
             else:
                 import torch
                 namespaces.add(torch)
+        elif hasattr(x, '__array_namespace__'):
+            namespaces.add(x.__array_namespace__(api_version=api_version))
         else:
             # TODO: Support Python scalars?
             raise TypeError(f"{type(x).__name__} is not a supported array type")
diff --git a/numpy-dev-xfails.txt b/numpy-dev-xfails.txt
new file mode 100644
index 00000000..5e270a95
--- /dev/null
+++ b/numpy-dev-xfails.txt
@@ -0,0 +1,57 @@
+# asarray(copy=False) is not yet implemented
+array_api_tests/test_creation_functions.py::test_asarray_arrays
+
+# finfo(float32).eps returns float32 but should return float
+array_api_tests/test_data_type_functions.py::test_finfo[float32]
+
+# Array methods and attributes not already on np.ndarray cannot be wrapped
+array_api_tests/test_has_names.py::test_has_names[array_method-to_device]
+array_api_tests/test_has_names.py::test_has_names[array_attribute-device]
+
+# linalg tests require cleanups
+# https://github.com/data-apis/array-api-tests/pull/101
+array_api_tests/test_linalg.py::test_solve
+
+# NumPy deviates in some special cases for floordiv
+array_api_tests/test_special_cases.py::test_binary[floor_divide(x1_i is +infinity and isfinite(x2_i) and x2_i > 0) -> +infinity]
+array_api_tests/test_special_cases.py::test_binary[floor_divide(x1_i is +infinity and isfinite(x2_i) and x2_i < 0) -> -infinity]
+array_api_tests/test_special_cases.py::test_binary[floor_divide(x1_i is -infinity and isfinite(x2_i) and x2_i > 0) -> -infinity]
+array_api_tests/test_special_cases.py::test_binary[floor_divide(x1_i is -infinity and isfinite(x2_i) and x2_i < 0) -> +infinity]
+array_api_tests/test_special_cases.py::test_binary[floor_divide(isfinite(x1_i) and x1_i > 0 and x2_i is -infinity) -> -0]
+array_api_tests/test_special_cases.py::test_binary[floor_divide(isfinite(x1_i) and x1_i < 0 and x2_i is +infinity) -> -0]
+array_api_tests/test_special_cases.py::test_binary[__floordiv__(x1_i is +infinity and isfinite(x2_i) and x2_i > 0) -> +infinity]
+array_api_tests/test_special_cases.py::test_binary[__floordiv__(x1_i is +infinity and isfinite(x2_i) and x2_i < 0) -> -infinity]
+array_api_tests/test_special_cases.py::test_binary[__floordiv__(x1_i is -infinity and isfinite(x2_i) and x2_i > 0) -> -infinity]
+array_api_tests/test_special_cases.py::test_binary[__floordiv__(x1_i is -infinity and isfinite(x2_i) and x2_i < 0) -> +infinity]
+array_api_tests/test_special_cases.py::test_binary[__floordiv__(isfinite(x1_i) and x1_i > 0 and x2_i is -infinity) -> -0]
+array_api_tests/test_special_cases.py::test_binary[__floordiv__(isfinite(x1_i) and x1_i < 0 and x2_i is +infinity) -> -0]
+array_api_tests/test_special_cases.py::test_iop[__ifloordiv__(x1_i is +infinity and isfinite(x2_i) and x2_i > 0) -> +infinity]
+array_api_tests/test_special_cases.py::test_iop[__ifloordiv__(x1_i is +infinity and isfinite(x2_i) and x2_i < 0) -> -infinity]
+array_api_tests/test_special_cases.py::test_iop[__ifloordiv__(x1_i is -infinity and isfinite(x2_i) and x2_i > 0) -> -infinity]
+array_api_tests/test_special_cases.py::test_iop[__ifloordiv__(x1_i is -infinity and isfinite(x2_i) and x2_i < 0) -> +infinity]
+array_api_tests/test_special_cases.py::test_iop[__ifloordiv__(isfinite(x1_i) and x1_i > 0 and x2_i is -infinity) -> -0]
+array_api_tests/test_special_cases.py::test_iop[__ifloordiv__(isfinite(x1_i) and x1_i < 0 and x2_i is +infinity) -> -0]
+
+# https://github.com/numpy/numpy/issues/21213
+array_api_tests/test_special_cases.py::test_binary[__pow__(x1_i is -infinity and x2_i > 0 and not (x2_i.is_integer() and x2_i % 2 == 1)) -> +infinity]
+array_api_tests/test_special_cases.py::test_binary[__pow__(x1_i is -0 and x2_i > 0 and not (x2_i.is_integer() and x2_i % 2 == 1)) -> +0]
+array_api_tests/test_special_cases.py::test_iop[__ipow__(x1_i is -infinity and x2_i > 0 and not (x2_i.is_integer() and x2_i % 2 == 1)) -> +infinity]
+array_api_tests/test_special_cases.py::test_iop[__ipow__(x1_i is -0 and x2_i > 0 and not (x2_i.is_integer() and x2_i % 2 == 1)) -> +0]
+array_api_tests/meta/test_hypothesis_helpers.py::test_symmetric_matrices
+
+# The test suite is incorrectly checking sums that have loss of significance
+# (https://github.com/data-apis/array-api-tests/issues/168)
+array_api_tests/test_statistical_functions.py::test_sum
+
+# fft functions are not yet supported
+# (https://github.com/data-apis/array-api-compat/issues/67)
+array_api_tests/test_fft.py::test_fft
+array_api_tests/test_fft.py::test_ifft
+array_api_tests/test_fft.py::test_fftn
+array_api_tests/test_fft.py::test_ifftn
+array_api_tests/test_fft.py::test_rfft
+array_api_tests/test_fft.py::test_irfft
+array_api_tests/test_fft.py::test_rfftn
+array_api_tests/test_fft.py::test_irfftn
+array_api_tests/test_fft.py::test_hfft
+array_api_tests/test_fft.py::test_ihfft