diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 6cc4895..3e65992 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -14,9 +14,10 @@ jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
         # pick lower and upper versions only
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.9", "3.12"]
 
     steps:
       - uses: actions/checkout@v4
@@ -56,6 +57,12 @@ jobs:
         run: |
           pytest -v gridit --doctest-modules
 
+      - name: Run tests with older packages
+        if: matrix.python-version == '3.9'
+        run: |
+          pip install "pandas<2.0" "geopandas<1.0" "fiona<1.10" "shapely<2.0" "numpy<2.0"
+          pytest -v -n2 --cov --cov-append
+
       - name: Upload coverage reports to Codecov
         uses: codecov/codecov-action@v4
         with:
diff --git a/pyproject.toml b/pyproject.toml
index 73b61f3..c36f965 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ classifiers = [
     "Programming Language :: Python :: 3 :: Only",
     "Topic :: Scientific/Engineering :: GIS",
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = [
     "numpy",
 ]
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 3ae5022..acb659a 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -110,7 +110,10 @@ def test_grid_from_bbox_array_from_vector_attribute(tmp_path, grid_from_bbox_arg
     )
     assert not (tmp_path / "out.prj").exists()
     with fiona.open(out_shp) as ds:
-        resulting_properties = dict(ds.schema["properties"])
+        resulting_properties = {
+            k: v.replace("int32", "int")
+            for k, v in dict(ds.schema["properties"]).items()
+        }
     expected_properties = {
         "idx": "int:4",
         "row": "int:2",
@@ -179,14 +182,18 @@ def test_grid_from_vector_array_from_netcdf(tmp_path):
         }
     )
     with fiona.open(out_shp) as ds:
-        assert dict(ds.schema["properties"]) == {
-            "idx": "int:4",
-            "row": "int:2",
-            "col": "int:2",
-            "quantile(0": "float:22.20",
-            "max": "float:22.20",
-        }
         assert len(ds) == 4620
+        resulting_properties = {
+            k: v.replace("int32", "int")
+            for k, v in dict(ds.schema["properties"]).items()
+        }
+    assert resulting_properties == {
+        "idx": "int:4",
+        "row": "int:2",
+        "col": "int:2",
+        "quantile(0": "float:22.20",
+        "max": "float:22.20",
+    }
 
 
 @requires_pkg("flopy")
diff --git a/tests/test_file.py b/tests/test_file.py
index 09834c7..fdbf192 100644
--- a/tests/test_file.py
+++ b/tests/test_file.py
@@ -163,7 +163,11 @@ def test_write_vector(tmp_path, grid_basic, grid_projection):
         assert not ds.crs
         schema = ds.schema
         assert schema["geometry"] == "Polygon"
-        assert dict(ds.schema["properties"]) == {
+        schema_properties = {
+            k: v.replace("int32", "int")
+            for k, v in dict(ds.schema["properties"]).items()
+        }
+        assert schema_properties == {
             "idx": "int:3",
             "row": "int:2",
             "col": "int:2",
@@ -203,7 +207,11 @@ def test_write_vector(tmp_path, grid_basic, grid_projection):
         assert ds.crs is not None
         schema = ds.schema
         assert schema["geometry"] == "Polygon"
-        assert dict(ds.schema["properties"]) == {
+        schema_properties = {
+            k: v.replace("int32", "int")
+            for k, v in dict(ds.schema["properties"]).items()
+        }
+        assert schema_properties == {
             "idx": "int:3",
             "row": "int:2",
             "col": "int:2",
@@ -243,7 +251,11 @@ def test_write_vector(tmp_path, grid_basic, grid_projection):
         assert ds.crs is not None
         schema = ds.schema
         assert schema["geometry"] == "Polygon"
-        assert dict(ds.schema["properties"]) == {
+        schema_properties = {
+            k: v.replace("int32", "int")
+            for k, v in dict(ds.schema["properties"]).items()
+        }
+        assert schema_properties == {
             "idx": "int",
             "row": "int",
             "col": "int",