diff --git a/protarrow/cast_to_proto.py b/protarrow/cast_to_proto.py
index bce3716..68b2f91 100644
--- a/protarrow/cast_to_proto.py
+++ b/protarrow/cast_to_proto.py
@@ -126,19 +126,18 @@ def _cast_array(
 
         # TODO: remove when https://github.com/apache/arrow/issues/40750 is fixed
         #  and library is pinned to pyarrow>=17.0.0
-        offsets = maybe_copy_offsets(array.offsets)
         keys = _cast_array(keys, key_field, config)
         values = _cast_array(values, value_field, config)
 
         if config.map_as_list:
             return _map_as_list_from_arrays(
-                offsets=offsets,
+                offsets=array.offsets,
                 keys=keys,
                 values=values,
                 config=config,
             )
         else:
-            return pa.MapArray.from_arrays(offsets, keys, values).cast(
+            return pa.MapArray.from_arrays(array.offsets, keys, values).cast(
                 pa.map_(
                     keys.type,
                     pa.field(
@@ -251,11 +250,3 @@ def cast_table(
         ],
         proto_schema,
     )
-
-
-def maybe_copy_offsets(offsets: pa.Array) -> pa.Array:
-    if offsets.offset != 0:
-        # TODO: this it not efficient, find a way to copy in arrow
-        return pa.array(offsets.to_pylist(), offsets.type)
-    else:
-        return offsets
diff --git a/pyproject.toml b/pyproject.toml
index 311e76d..e6d05be 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ classifiers = [
   "Programming Language :: Python :: 3.14",
 ]
 dynamic = [ "version" ]
-dependencies = [ "googleapis-common-protos", "protobuf", "pyarrow" ]
+dependencies = [ "googleapis-common-protos", "protobuf", "pyarrow>=17" ]
 urls."Bug Tracker" = "https://github.com/tradewelltech/protarrow/issues"
 urls.Changelog = "https://github.com/tradewelltech/protarrow/blob/main/CHANGELOG.md"
 documentation = "https://protarrow.readthedocs.io/en/latest/"
diff --git a/tests/test_conversion.py b/tests/test_conversion.py
index 264826e..23a653b 100644
--- a/tests/test_conversion.py
+++ b/tests/test_conversion.py
@@ -23,7 +23,6 @@
     cast_table,
     get_arrow_default_value,
     get_casted_array,
-    maybe_copy_offsets,
 )
 from protarrow.common import M, ProtarrowConfig, offset_values_array
 from protarrow.message_extractor import MessageExtractor
@@ -799,6 +798,8 @@ def test_cast_map_offset():
     )
     assert _cast_array(from_array, field, ProtarrowConfig()) == to_array
 
+    # Test it works with offset array / slice views.
+    # https://github.com/apache/arrow/issues/40750
     assert _cast_array(from_array[1:], field, ProtarrowConfig()) == to_array[1:]
 
 
@@ -825,18 +826,6 @@ def test_cast_list_offset():
     assert _cast_array(from_array[1:], field, ProtarrowConfig()) == to_array[1:]
 
 
-def test_maybe_copy_offsets():
-    array = pa.array([1, 2, 3], pa.int32())
-    assert maybe_copy_offsets(array) is array  # no copy
-    view = array[1:]
-    copy = maybe_copy_offsets(array[1:])
-    assert copy == view
-    assert copy is not view  # copy
-    assert copy.offset == 0
-    # Sadly pa.array is highly optimized
-    assert pa.array(array) is array
-
-
 def test_map_cast():
     array = pa.array(
         [
diff --git a/uv.lock b/uv.lock
index 1634d56..0d450a1 100644
--- a/uv.lock
+++ b/uv.lock
@@ -663,6 +663,7 @@ wheels = [
 name = "griffelib"
 version = "2.0.0"
 source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/ad/06/eccbd311c9e2b3ca45dbc063b93134c57a1ccc7607c5e545264ad092c4a9/griffelib-2.0.0.tar.gz", hash = "sha256:e504d637a089f5cab9b5daf18f7645970509bf4f53eda8d79ed71cce8bd97934", size = 166312, upload-time = "2026-03-23T21:06:55.954Z" }
 wheels = [
     { url = "https://files.pythonhosted.org/packages/4d/51/c936033e16d12b627ea334aaaaf42229c37620d0f15593456ab69ab48161/griffelib-2.0.0-py3-none-any.whl", hash = "sha256:01284878c966508b6d6f1dbff9b6fa607bc062d8261c5c7253cb285b06422a7f", size = 142004, upload-time = "2026-02-09T19:09:40.561Z" },
 ]
@@ -1440,15 +1441,15 @@ dev = [
 requires-dist = [
     { name = "googleapis-common-protos" },
     { name = "protobuf" },
-    { name = "pyarrow" },
+    { name = "pyarrow", specifier = ">=17.0.0" },
 ]
 
 [package.metadata.requires-dev]
 dev = [
-    { name = "coverage", specifier = ">=6.5.0" },
+    { name = "coverage", specifier = ">=6.5" },
     { name = "flake8", specifier = ">=5.0.4" },
-    { name = "git-changelog", specifier = ">=2.2.0" },
-    { name = "grpcio-tools", specifier = ">=1.46.0" },
+    { name = "git-changelog", specifier = ">=2.2" },
+    { name = "grpcio-tools", specifier = ">=1.46" },
     { name = "inflection", specifier = ">=0.5.1" },
     { name = "isort", specifier = ">=5.10.1" },
     { name = "jinja2", specifier = ">=3.1.2" },
@@ -1456,12 +1457,12 @@ dev = [
     { name = "mkdocs-material", specifier = ">=9.0.3" },
     { name = "mkdocstrings", extras = ["python"], specifier = ">=0.21.2" },
     { name = "pip-tools", specifier = ">=6.12.1" },
-    { name = "pre-commit", specifier = ">=2.20.0" },
-    { name = "pylint", specifier = ">=2.15.0" },
-    { name = "pytest", specifier = ">=7.2.0" },
-    { name = "pytest-benchmark", specifier = ">=4.0.0" },
+    { name = "pre-commit", specifier = ">=2.20" },
+    { name = "pylint", specifier = ">=2.15" },
+    { name = "pytest", specifier = ">=7.2" },
+    { name = "pytest-benchmark", specifier = ">=4" },
     { name = "pytest-cov" },
-    { name = "pytest-xdist", specifier = ">=3.1.0" },
+    { name = "pytest-xdist", specifier = ">=3.1" },
     { name = "ruff" },
 ]