diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 8075b013b..b8fddc244 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -8,13 +8,24 @@ on:
 
 jobs:
   tests:
-    name: Py${{ matrix.python-version }} ${{ matrix.os }}
+    name: Py${{ matrix.python-version }} ${{ matrix.os }} NumPy${{ matrix.numpy-version }}
     runs-on: ${{ matrix.os }}
 
     strategy:
       matrix:
         os: [macos-latest, windows-latest, ubuntu-22.04]
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.9', '3.10', '3.11', '3.12']
+        numpy-version: ['<2', '>=2']
+        include:
+          - os: macos-latest
+            python-version: '3.8'
+            numpy-version: '<2'
+          - os: windows-latest
+            python-version: '3.8'
+            numpy-version: '<2'
+          - os: ubuntu-22.04
+            python-version: '3.8'
+            numpy-version: '<2'
 
     steps:
       - uses: actions/checkout@v4.1.1
@@ -41,6 +52,10 @@ jobs:
           pip install --upgrade pip setuptools wheel
           pip install .[test]
 
+      - name: Install NumPy
+        run: |
+          pip install --force-reinstall "numpy${{ matrix.numpy-version }}"
+
       - name: Tests
         run: |
           pip install cython
diff --git a/tests/test_apis/test_numpy_int.py b/tests/test_apis/test_numpy_int.py
index 2ffa43f01..c341b555a 100644
--- a/tests/test_apis/test_numpy_int.py
+++ b/tests/test_apis/test_numpy_int.py
@@ -5,7 +5,10 @@
 
 
 def test1():
-    lat, lng = 37.7752702151959, -122.418307270836,
+    lat, lng = (
+        37.7752702151959,
+        -122.418307270836,
+    )
     assert h3.latlng_to_cell(lat, lng, 9) == 617700169958293503
 
 
@@ -31,3 +34,19 @@ def test_compact_cells():
     assert isinstance(cells, np.ndarray)
 
     assert h3.compact_cells(cells) == [h]
+
+
+def test_numpy_str():
+    expected = [
+        617700169957507071,
+        617700169957769215,
+        617700169958031359,
+        617700169958293503,
+        617700169961177087,
+        617700169964847103,
+        617700169965109247,
+    ]
+    cells = np.array([h3.int_to_str(h) for h in expected])
+    got = [h3.str_to_int(c) for c in cells]
+
+    assert expected == got