diff --git a/.github/workflows/test-rasterstats.yml b/.github/workflows/test-rasterstats.yml
index bc979fe..bc2b292 100644
--- a/.github/workflows/test-rasterstats.yml
+++ b/.github/workflows/test-rasterstats.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
diff --git a/pyproject.toml b/pyproject.toml
index dbd35eb..b9d858a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -48,7 +48,7 @@ dependencies = [
 
 [project.optional-dependencies]
 progress = ["tqdm"]
-fiona = ["fiona"]
+fiona = ["fiona; python_version < '3.14'"]
 docs = ["numpydoc", "sphinx", "sphinx-rtd-theme"]
 test = [
   "coverage",
diff --git a/src/rasterstats/io.py b/src/rasterstats/io.py
index 93e9015..a07d698 100644
--- a/src/rasterstats/io.py
+++ b/src/rasterstats/io.py
@@ -34,17 +34,9 @@
 
 
 def _fiona_generator(obj, layer=0):
-    """Yield GeoJSON-like Feature dicts using fiona (optional engine).
+    """Yield GeoJSON-like Feature dicts using fiona (optional engine)."""
+    import fiona
 
-    Raises ImportError with a helpful message if fiona is not installed.
-    """
-    try:
-        import fiona
-    except ImportError:
-        raise ImportError(
-            "fiona is required for engine='fiona'. "
-            "Install it with: pip install rasterstats[fiona]"
-        )
     try:
         import fiona.model
 
diff --git a/tests/test_io.py b/tests/test_io.py
index 8242452..e2327aa 100644
--- a/tests/test_io.py
+++ b/tests/test_io.py
@@ -8,7 +8,6 @@
 from shapely.geometry import shape
 
 from rasterstats.io import (  # todo parse_feature
-    DEFAULT_CHUNK_SIZE,
     Raster,
     _is_vector_file,
     boundless_array,
@@ -537,7 +536,7 @@ def test_geodataframe():
 
 
 def test_feature_generator_chunk_size(tmp_path):
-    """Reading with default engine, fiona engine, and alternative chunk sizes
+    """Reading with default engine vs alternative chunk sizes,
     all result in equivalent feature dicts."""
     geojson = {
         "type": "FeatureCollection",
@@ -555,9 +554,31 @@ def test_feature_generator_chunk_size(tmp_path):
 
     default_results = list(feature_generator(polygons))
     small_chunk_results = list(feature_generator(polygons, chunk_size=2))
-    fiona_results = list(feature_generator(polygons, engine="fiona", chunk_size=2))
 
     assert default_results == small_chunk_results
+
+
+def test_feature_generator_engines(tmp_path):
+    """Reading with default engine vs fiona engine,
+    all result in equivalent feature dicts."""
+    _ = pytest.importorskip("fiona")
+    geojson = {
+        "type": "FeatureCollection",
+        "features": [
+            {
+                "type": "Feature",
+                "geometry": {"type": "Point", "coordinates": [float(i), 0.0]},
+                "properties": {"n": i},
+            }
+            for i in range(6)
+        ],
+    }
+    p = tmp_path / "chunked.geojson"
+    p.write_text(json.dumps(geojson))
+
+    default_results = list(feature_generator(polygons))
+    fiona_results = list(feature_generator(polygons, engine="fiona", chunk_size=2))
+
     # cannot compare them directly since they differ in tuples vs list representation for some reason
     # let json roundtrip normalize it
     assert json.loads(json.dumps(default_results)) == json.loads(