diff --git a/ehrapy/preprocessing/_quality_control.py b/ehrapy/preprocessing/_quality_control.py
index 582f6a3c..ea6ce4af 100644
--- a/ehrapy/preprocessing/_quality_control.py
+++ b/ehrapy/preprocessing/_quality_control.py
@@ -5,7 +5,6 @@
 from pathlib import Path
 from typing import TYPE_CHECKING, Literal
 
-import dask.array as da
 import numpy as np
 import pandas as pd
 from lamin_utils import logger