diff --git a/leanframe/core/frame.py b/leanframe/core/frame.py
index 9173014..505fb71 100644
--- a/leanframe/core/frame.py
+++ b/leanframe/core/frame.py
@@ -50,4 +50,11 @@ def __getitem__(self, key: str):
         return leanframe.core.series.Series(self._data[key])
 
     def to_pandas(self) -> pandas.DataFrame:
-        return self._data.to_pandas()
+        """Convert the DataFrame to a pandas.DataFrame.
+
+        Where possible, pandas.ArrowDtype is used to avoid lossy conversions
+        from the database types to pandas.
+        """
+        return self._data.to_pyarrow().to_pandas(
+            types_mapper=lambda type_: pandas.ArrowDtype(type_)
+        )
diff --git a/leanframe/core/series.py b/leanframe/core/series.py
index fc4c0b1..837292a 100644
--- a/leanframe/core/series.py
+++ b/leanframe/core/series.py
@@ -37,4 +37,6 @@ def name(self) -> str:
 
     def to_pandas(self) -> pandas.Series:
         """Convert to a pandas Series."""
-        return self._data.to_pandas()
+        return self._data.to_pyarrow().to_pandas(
+            types_mapper=lambda type_: pandas.ArrowDtype(type_)
+        )
diff --git a/tests/unit/test_series.py b/tests/unit/test_series.py
index 61ee8d5..1f3eb20 100644
--- a/tests/unit/test_series.py
+++ b/tests/unit/test_series.py
@@ -16,6 +16,7 @@
 
 import pandas
 import pandas.testing
+import pyarrow
 import pytest
 
 import leanframe
@@ -25,11 +26,13 @@
     ("series_pd",),
     (
         pytest.param(
-            pandas.Series([1, 2, 3]),
+            pandas.Series([1, 2, 3], dtype=pandas.ArrowDtype(pyarrow.int64())),
             id="int64",
         ),
         pytest.param(
-            pandas.Series([1.0, float("nan"), 3.0]),
+            pandas.Series(
+                [1.0, float("nan"), 3.0], dtype=pandas.ArrowDtype(pyarrow.float64())
+            ),
             id="float64",
         ),
     ),