diff --git a/tdigest_plugin/__init__.py b/tdigest_plugin/__init__.py
index 2c4ff89..1e990e5 100644
--- a/tdigest_plugin/__init__.py
+++ b/tdigest_plugin/__init__.py
@@ -5,7 +5,8 @@
 
 import polars as pl
 from polars.plugins import register_plugin_function
-from tdigest_plugin.utils import parse_into_expr, parse_version
+
+from tdigest_plugin.utils import parse_version
 
 if TYPE_CHECKING:
     from polars.type_aliases import IntoExpr
diff --git a/tests/test_estimate_quantiles.py b/tests/test_estimate_quantiles.py
index fedcb3d..5b50a40 100644
--- a/tests/test_estimate_quantiles.py
+++ b/tests/test_estimate_quantiles.py
@@ -1,8 +1,8 @@
-from decimal import InvalidOperation
 
 import polars as pl
 import pytest
-from polars import Float32, Float64, Int16, Int32, Utf8, col
+from polars import Float32, Int32, Utf8, col
+
 from tdigest_plugin import estimate_median, estimate_quantile, tdigest
 
 df_int = pl.DataFrame(
@@ -102,7 +102,7 @@ def test_estimate_quantile_f32():
 def test_estimate_quantile_utf8():
 
     with pytest.raises(pl.exceptions.ComputeError):
-        df_median = (
+        (
             df_float.with_columns(col("values").cast(Utf8))
             .group_by("group")
             .agg(