diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 432460d..159f79f 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -14,3 +14,8 @@ repos:
       - id: ruff
         types_or: [python, pyi, jupyter]
         args: [--fix, --show-fixes, --exit-non-zero-on-fix]
+  - repo: https://github.com/pycqa/isort
+    rev: 5.13.2
+    hooks:
+      - id: isort
+        args: [--profile, black]
diff --git a/polars_bio/__init__.py b/polars_bio/__init__.py
index 2999923..d1cbd29 100644
--- a/polars_bio/__init__.py
+++ b/polars_bio/__init__.py
@@ -1,4 +1,4 @@
-from .overlap import overlap, ctx
+from .overlap import ctx, overlap
 from .polars_bio import OverlapFilter
 
 __all__ = ["overlap", "ctx", "OverlapFilter"]
diff --git a/polars_bio/overlap.py b/polars_bio/overlap.py
index 3979866..a5347a6 100644
--- a/polars_bio/overlap.py
+++ b/polars_bio/overlap.py
@@ -9,8 +9,8 @@
 import pyarrow.compute as pc
 from polars.io.plugins import register_io_source
 from typing_extensions import TYPE_CHECKING, Union
-from .polars_bio import overlap_scan, overlap_frame
-from .polars_bio import BioSessionContext, OverlapFilter
+
+from .polars_bio import BioSessionContext, OverlapFilter, overlap_frame, overlap_scan
 
 
 def singleton(cls):
diff --git a/tests/_expected.py b/tests/_expected.py
index 4aeb397..cf76e5d 100644
--- a/tests/_expected.py
+++ b/tests/_expected.py
@@ -1,6 +1,6 @@
-import mdpd
 from pathlib import Path
 
+import mdpd
 import pandas as pd
 import polars as pl
 
diff --git a/tests/test_bioframe.py b/tests/test_bioframe.py
index 1e75066..5ec53ea 100644
--- a/tests/test_bioframe.py
+++ b/tests/test_bioframe.py
@@ -1,10 +1,11 @@
 import bioframe as bf
 import pandas as pd
-import polars_bio as pb
-
 from _expected import BIO_PD_DF1, BIO_PD_DF2
+
+import polars_bio as pb
 from polars_bio import OverlapFilter
 
+
 class TestOverlapBioframe:
     result = pb.overlap(BIO_PD_DF1, BIO_PD_DF2, output_type="pandas.DataFrame", overlap_filter=OverlapFilter.Strict)
     result_bio = bf.overlap(BIO_PD_DF1, BIO_PD_DF2,
diff --git a/tests/test_native_overlap.py b/tests/test_native_overlap.py
index 77169ef..69848d3 100644
--- a/tests/test_native_overlap.py
+++ b/tests/test_native_overlap.py
@@ -1,7 +1,7 @@
 import pandas as pd
+from _expected import DF_PATH1, DF_PATH2, PD_DF_OVERLAP
 
 import polars_bio as pb
-from _expected import PD_DF_OVERLAP, DF_PATH1, DF_PATH2
 
 
 class TestOverlapNative:
diff --git a/tests/test_pandas_overlap.py b/tests/test_pandas_overlap.py
index 2bf2a1f..132ea50 100644
--- a/tests/test_pandas_overlap.py
+++ b/tests/test_pandas_overlap.py
@@ -1,7 +1,7 @@
 import pandas as pd
+from _expected import PD_DF1, PD_DF2, PD_DF_OVERLAP
 
 import polars_bio as pb
-from _expected import PD_DF_OVERLAP, PD_DF1, PD_DF2
 
 
 class TestOverlapPandas:
diff --git a/tests/test_polars_overlap.py b/tests/test_polars_overlap.py
index 3d23430..a9d8e3f 100644
--- a/tests/test_polars_overlap.py
+++ b/tests/test_polars_overlap.py
@@ -1,5 +1,6 @@
+from _expected import PL_DF1, PL_DF2, PL_DF_OVERLAP
+
 import polars_bio as pb
-from _expected import PL_DF_OVERLAP, PL_DF1, PL_DF2
 
 
 class TestOverlapPolars: